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🗂️ Browse by topic →How to Master Battle Mate
A complete Battle Mate strategy guide: archer volleys, cavalry flanks, soldier walls, simultaneous-turn timing, and the order economy that wins clean.
How to Master Emoji Explorer
A relaxed, goal-free wander through 12 emoji worlds. Learn how forks, the back button, and the explored percentage work to see them all.
How to Master Human Map
Read the world's birth and death rhythm on a live dot-map. Learn why some countries pulse green and others red, all from real demographic maths.
How to Master Human Timer
Recognise each CAPTCHA type instantly, stay accurate under speed, and beat your per-difficulty record in this beat-the-clock verification speedrun.
How to Master Inflation
Build intuition for inflation by estimating what old US prices are worth today. Learn the CPI multiplier per era and pick the closest option fast.
How to Master Paper Folds
Estimate how many paper folds reach a giraffe, Everest, or the Moon. Learn the doubling rule, the times-1000-per-10-folds anchor, and a landmark ladder.
How to Master Perfect Day
Design your ideal 24 hours with sliders, then compare your split to real country averages. A reflective tool for building a balanced day.
How to Master Perfect Shape
Score higher in Perfect Shape by drawing even, steady outlines. Learn why size never matters, evenness always does, and how to read the overlay.
How to Master Progress
Turn the live year, month, week, day and hour bars into real time awareness, then build a completion habit with the lifetime task counter.
How to Master Timeline
Place real historical events on a year axis by dragging. No wrong answers, just closeness. Learn to anchor, reason by era, and beat your best.
How to Master Which Curve
Learn to read the shape of real-world change. Spot exponential growth, seasonal bells, S-curves and collapses, and beat the straight-line decoy.
How to Master Nurikabe
Learn to carve islands from a connected sea using logic, constraint propagation, and region counting - no guessing needed.
How to Master the Ordering Game
Build an unbreakable streak by mastering chronology, size, and ranking across three intertwined ordering challenges.
How to Master Akari
Learn constraint logic to place bulbs, light every cell, and solve Akari puzzles systematically with forced moves and deduction.
How to Master Verbal Analogies
Master word-pair relationships by naming the pattern first, then matching. Learn the 12+ relationship types that appear on the SAT, GRE, and IQ tests.
How to Master Backwards
Master reverse-reading by anchoring on the last letter, scanning shapes instead of sounds, and building speed across three difficulty levels.
How to Master Bubble Wrap
Learn systematic scanning and reflex tactics to pop every bubble before time runs out. Build speed through rhythm, not chaos.
How to Master Bullseye
Master arc physics, angle control, and power estimation to hit the shrinking gold and build your streak in this precision archery challenge.
How to Master But Why?
Master causal reasoning by completing everyday explanations. Learn to recognize mechanism patterns and eliminate wrong answers using logical chains.
How to Master Card Count
Master working memory and mental arithmetic by maintaining a running total as positive and negative numbers flash at speed.
How to Master Catch the Cat
Block escape routes and trap the cat on a hex board. Learn to read shortest paths, predict movement, and close corridors before it escapes.
How to Master Chess Mate
Train mate-in-one pattern recognition in UCI notation. Build visual intuition for back-rank, smothered, and two-piece checkmate patterns.
How to Master Circle Puzzle
Decode hidden gear ratios, plan your taps, and align all wheel markers before your budget runs out in this meshed-wheel alignment puzzle.
How to Master Circuit Breaker
Learn the three logic gates (AND, OR, XOR) cold and predict outputs before tapping. Build streaks through systematic reasoning, not guessing.
How to Master Coast
Call the stop zone before the stone settles. Learn to read deceleration early and find the speed-accuracy balance that beats your personal best.
How to Master Color Memory
Build longer Simon Says sequences with chunking, audio melody tracking, and rhythm. Progress from 4 to 24 colors and know when to increase speed.
How to Master Compound Interest
Build exponential growth intuition by estimating compounded balances. Learn the doubling rule, chunk long timeframes, and calibrate on every reveal.
How to Master Guess the Country
Identify countries from geography and economy clues. Commit early on harder clues to maximize points and build mental maps of global regions.
How to Master Crazy Comparisons
Train your real-world scale intuition by estimating wild size comparisons and building mental reference points.
How to Master Crocodile Dentist
Master risk assessment under uncertainty. Learn when to tap and when to quit, using math and discipline to maximize your long-term score.
How to Master Crossword
Master crosswords by exploiting constraint intersections, decoding cryptic clues as two-part riddles, and cross-checking to prevent cascading errors.
How to Master Cups
Track the ball through shuffled cups to win. Build visual focus and multiple-object tracking through proven techniques.
How to Master Decay Time
Train magnitude sense by estimating how long everyday items take to decompose. Build intuition for timescales from weeks to millennia.
How to Master Deduction
Master logic puzzles by systematically eliminating candidates that break any clue. Learn constraint testing, clue ordering, and verification tactics.
How to Master Define
Master Define by learning exact word meanings, not just topics. Eliminate distractors, verify before committing, and use difficulty as a skill gate.
How to Master the Dice Roller
Roll 1-100 six-sided dice instantly for board games, RPGs, and probability lessons. See the Law of Large Numbers in action with every throw.
How to Master Did You Know?
Master Did You Know? by reading facts fully, eliminating wrong options fast, and staying calm as your streak climbs across three fact flavours.
How to Master Emoji Typewriter
Turn any text into a random emoji grid. Learn how randomization works, when to use PNG vs. plain text, and how to compose share-worthy designs.
How to Master Feeling Circle
Learn Plutchik's Wheel to name complex emotions and their intensities. Build emotional granularity through four game modes and deliberate practice.
How to Master Classify the Era
Spot Renaissance, Baroque, and Modernism across paintings, music, and literature by learning the signatures that define each era, not just famous works.
How to Master Product Estimate
Train your order-of-magnitude sense to estimate products and quantities fast, without exact arithmetic. Speed and magnitude sense beat precision.
How to Master Estimation
Build number sense through Fermi estimation. Learn to judge quantities, products, and volumes without a calculator.
How to Master Facts
Learn to spot true statements fast. Train pattern recognition on math, calendar, and geography facts.
How to Master Random Facts
Use Random Facts as a daily brain warm-up tool. Master it through consistent curiosity breaks, classroom prompts, and fact-retention habits.
How to Master Finance Lab
Learn to recognize candlesticks, identify Greeks, and spot valuation traps across 3 core finance topics in one unified game.
How to Master Spot the Difference
Train your attention span by spotting emoji changes fast. Learn to spot 1-20 differences in walls of 100-500 emojis.
How to Master Fold Out
Train spatial visualisation by mentally folding 2D nets into 3D solids. Master cube, pyramid, and prism recognition.
How to Master Fractions Faster
Train fraction comparison through instant feedback. Learn to spot the largest value without falling for visual tricks.
How to Master Fun Facts
Master the cloze trivia format: read the full sentence, use context to eliminate wrong answers, and build a sticky mental library of surprising facts.
How to Master Gear Train
Learn the one rule that solves every Gear Train puzzle: count gears, apply parity, predict rotation. Clockwise or counter-clockwise, every time.
How to Master Geography
Build a lasting mental map by drilling both directions: place features on a map, then name them from a pin. Alternate modes to close gaps fast.
How to Master Geography Blanks
Crack the cloze streak format: read the full sentence first, activate regional knowledge, and eliminate wrong answers before picking the right one.
How to Master Hangman
Use letter frequency (ETAOIN), read revealed patterns, and manage your six wrong guesses to save the stickman consistently across all difficulty tiers.
How to Master Tower of Hanoi
Crack Tower of Hanoi at every disk count by learning the recursive three-step pattern: clear the stack, move the biggest disk, rebuild on top.
How to Master Hash
Crack hidden logic functions by designing discriminating tests, not random guesses. Fewer tests, higher score - learn the hypothesis-driven method.
How to Master Bridges (Hashiwokakero)
Master Bridges puzzles through forced moves, degree counting, and connectivity reasoning. Learn concrete techniques to solve faster with fewer mistakes.
How to Master Heads of State
Learn to identify world leaders across eras and countries. Master historical timelines to ace Heads of State.
How to Master Heavy Friction
Master the tactile factory game: balance lever pulls, hire workers strategically, manage admin coverage, and expand your automated empire.
How to Master History Quiz
Learn the three-mode history game: ace When, Who, and What challenges by mastering era recognition and strategic difficulty climbing.
How to Master History Blanks
Master History Blanks by reading full context before answering, eliminating wrong choices systematically, and using streaks to identify knowledge gaps.
How to Master How Many Fit?
Learn spatial reasoning by dividing 3-D blocks. Count cubes, multiply dimensions, and master volume division in your head.
How to Master Inference
Master Inference by eliminating impossible bags first, then matching colour ratios to pick the bag that best explains your draw.
How to Master Infinity Loop
Learn spatial rotation strategies to close every pipe connection. Master tile alignment and solve seamless networks faster.
How to Master Laser Bounce
Learn angle prediction and spatial reasoning by spinning mirrors to bounce lasers into goals, one reflection at a time.
How to Master Load Bearer
Learn structural physics through real equations. Master beams, columns, arches and cables by predicting what holds under load.
How to Master Loading
Learn to tap faster and stay focused as bars accelerate endlessly. Build reaction speed and pressure management.
How to Master Logic Puzzles
Master six Japanese constraint puzzles: learn deduction strategies, common traps, and build your solving streak.
How to Master Where on the Map
Learn spatial memory by tracing step-by-step directions on a grid map. Master direction tracking, mental rotation, and working memory.
How to Master Market Health
Learn to read market indicators like a pro · understand what each gauge really means and which way is bullish.
How to Master Mastermind Deduce
Crack secret codes by treating every peg row as a constraint. Eliminate impossible codes systematically and converge on the one survivor.
How to Master Speed Math
Train mental arithmetic across six operations by learning distractor patterns, using last-digit checks, and climbing the range ladder one step at a time.
How to Master Matrix Reasoning
Solve Raven-style grid puzzles by scanning rows then columns, naming the rule explicitly, and testing it against all eight visible cells before picking.
How to Master Measure It
Calculate circumference, area, volume and radius for real objects. Master the formulas, spot distractor mistakes, and build streak-proof geometry speed.
How to Master Flag a Mine
Learn pure Minesweeper deduction: read number constraints, count neighbours precisely, and flag only cells that are mines in every valid board state.
How to Master Mirror Draw
Build perfect reflections cell by cell. Master the distance method, the systematic column sweep, and the reveal-and-compare habit to eliminate near misses.
How to Master Mirror Symmetry
Spot the single pixel or emoji that breaks bilateral symmetry. Train zone-scanning, peripheral detection, and the recheck habit to stop false positives.
How to Master Mixing
Learn the colour-blend rules and kitchen transformations that build long streaks in Mixing - the picture-only combination game.
How to Master Mosaic
Spot famous paintings as pixels reveal - learn the 30-work catalogue, read silhouettes early, and score big before the canvas completes.
How to Master Movie Blanks
Build long streaks in Movie Blanks by reading context clues, eliminating wrong answers fast, and staying calm under pressure.
How to Master Multi-Tasker
Train divided attention by solving arithmetic while catching a bell that rings faster with each correct answer. Tips to stay sharp under pressure.
How to Master Music Lab
Build real pitch recall on a virtual piano with two modes - Tones for random sequences, Songs for famous melodies. Daily practice beats cramming.
How to Master Name Rarity
Two names, one choice: pick the rarer one. Learn the patterns - historical cycles, regional concentration, spelling splits - that drive accuracy.
How to Master Name the Shape
Build geometry vocabulary fast - learn which features define each shape, avoid the rhombus and trapezoid traps, and build perfect streaks.
How to Master Nuance
Train low-contrast colour perception to spot digits and letters fading into flat backgrounds - tactics, drills, and difficulty progression.
How to Master Odd One Out
Train abstract reasoning by spotting the hidden rule and finding which item breaks it. Learn the core tactics and patterns.
How to Master Odds & Probability
Train fast probability intuition by comparing likelihoods and learning true odds from real-world scenarios.
How to Master Old Curses
Decode archaic oaths and insults by learning what they really meant and why they once scandalized entire societies.
How to Master Pathfinder
Learn spatial memory techniques to memorize and recreate arrow paths in Pathfinder - the sequence recall training game.
How to Master Pattern Recognition
Train fluid intelligence by completing matrices, spotting odd ones out, and deducing hidden rules across three complementary modes.
How to Master the Periodic Table
Learn to identify all 118 elements by symbol, atomic number, and position. Build chemistry fluency through strategic pattern recognition.
How to Master Pi
Learn the numpad path method to memorize pi and other mathematical constants using spatial and motor memory.
How to Master Power Grid
Master Power Grid by thinking in circuits, not just arithmetic. Toggle wires to route exactly the right power to the bulb and build your streak.
How to Master Prime Time
Learn to instantly classify numbers as prime or composite. Speed up your number theory fluency with proven tactics.
How to Master Proverbs
Learn to recognize cultural sayings fast by building pattern memory and cultural literacy across languages.
How to Master Quote Blanks
Complete famous quotes by picking the right missing word. Master context clues, patterns, and streaks.
How to Master Recipe Blanks
Build long streaks in Recipe Blanks by learning cooking patterns, using context clues to eliminate wrong answers, and reasoning through each cloze prompt.
How to Master Red Day Match
Learn to match global holidays to their dates, religions, and countries. Master all six traditions and six calendar systems to build long streaks.
How to Master Riddles
Solve riddles faster by recognising the five types, spotting misdirection by difficulty, and using answer-count to calibrate elimination vs. conviction.
How to Master Robot Programmer
Plan robot routes, mentally execute every turn and move before pressing Run, and debug crashes by tracing back through your program step by step.
How to Master Rubik's Cube
Build notation fluency with the streak quiz, then apply every move on the interactive 3D cube to learn beginner algorithms before touching a physical cube.
How to Master Rule Induction
Learn to spot hidden patterns by forming testable hypotheses, checking them against each new example, and refining your rule when feedback surprises you.
How to Master Traveling Salesman
Find the shortest loop through every city by spotting self-crossing routes, building tours from map geometry, and refining with each level's feedback.
How to Master Schedule Conflict
Crack Schedule Conflict's constraint puzzles fast - read clues in order, build a mental availability map, and eliminate impossible slots.
How to Master Science Blanks
Build longer streaks in Science Blanks - use context clues, eliminate impossible answers, and recognize the blank's category before scanning options.
How to Master Scratch Card
Win more Scratch Card rounds by committing early when odds favour you and quitting the moment your blank budget runs thin.
How to Master Number Sequences
Spot arithmetic, Fibonacci, triangular, and ten other patterns fast. Run a mental checklist on every round before you click.
How to Master Shadow Cast
Train spatial projection by reading a light's corner position and predicting the 2D shadow a block casts - one rule covers every round.
How to Master Shikaku
Partition a grid into rectangles where every number matches its rectangle's area - start with constrained clues and cascade from there.
How to Master Silhouette
Recognize 100 Twemoji shapes from their black outlines alone - learn by category, then sharpen within-category discrimination at higher difficulty.
How to Master Slitherlink
Solve Slitherlink faster by mastering edge deduction, saturation logic, and the constraint chains that lock in a valid closed loop.
How to Master Spatial Reasoning
Train mental rotation, net folding, and shadow projection. Build visual-spatial skills with focused practice and strategic techniques.
How to Master Mental Rotation
Train your 3D visualization by rotating shapes mentally. Learn tactics to spot same vs. mirrored objects and climb the difficulty curve.
How to Master Sports Blanks
Build unstoppable streaks by sharpening sports knowledge and mastering pattern recognition in real time.
How to Master Stroop
Learn to overcome the Stroop effect and sharpen your selective attention with proven techniques and strategies.
How to Master Sudoku Force
Train forced-move recognition to solve full Sudoku puzzles faster by isolating and repeating the core scanning skill.
How to Master Tone Memory
Learn ear-training tactics to hold and replay growing piano sequences perfectly, round after round.
How to Master Trig Drills
Learn exact sin, cos, tan values for all 16 reference angles. Memory techniques, sign rules, and a structured practice routine.
How to Master Fast Typing
Build WPM and accuracy with real-time feedback. Learn speed tactics, error recovery, and progressive practice routines.
How to Master Useful Facts
Learn to spot the right word in practical facts. Build knowledge and reading comprehension through cloze trivia.
How to Master Vector Arrows
Learn to add arrows tip-to-tail and judge their combined direction like a spatial reasoning expert.
How to Master Flashcards
Learn vocabulary across 25 languages using emoji, words, and translations. Build unbreakable streaks with the right strategy.
How to Master Volume Estimate
Build spatial reasoning and mental math speed by comparing box dimensions and calculating volume in your head.
How to Master Whack-a-Mole
Train lightning reflexes and sustained attention. Master the grid, predict patterns, and hit your target before time runs out.
How to Master Where's MemPi
Spot MemPi's coral pi glyph hidden in walls of coral, red, and pink emojis. Shape recognition strategies for every difficulty.
How to Master Which Philosophy?
Learn to match famous philosophical statements to their schools and thinkers. Master categorization, keyword spotting, and philosophical reasoning.
How to Master Who Composed It?
Train musical ear recognition by matching classical works to composers. Learn style patterns and instrumentation cues to identify pieces instantly.
How to Master Whodunit
Solve every case by matching clues to the one suspect whose marks explain them all. Learn the art of abductive reasoning.
How to Master Who Made This?
Train creator recognition across art, literature, and music. Tips for building streaks in Who Made This? across centuries and continents.
How to Master Who Painted It?
Learn to recognize famous paintings and identify their artists by analyzing style, period, and visual cues across art history.
How to Master Who Wrote It?
Learn to recognise literary voices and match excerpts to authors by understanding style, period, and theme.
How to Master Melody Lab
Learn famous tunes a few notes at a time. Master auditory memory, phrase chunking, and melodic recall in Melody Lab.
How to Master Word Games
Master Wordle, Hangman, and Word Square with deduction, letter frequency, and vocabulary tactics in one hub.
How to Master Wordle
Learn colour-code deduction, optimal openers, and second-guess tactics to solve Wordle in 4 attempts or fewer.
How to Master Word Square
Spot pangrams, hunt long words, and score efficiently in Word Square - the anagram-pool brain game from PlayMemorize.
Memorise Algeria's Top 10 Cities - In Order
A simple trick to remember Algeria's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Argentina's Top 10 Cities - In Order
A simple trick to remember Argentina's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Bangladesh's Top 10 Cities - In Order
A simple trick to remember Bangladesh's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Brazil's Top 10 Cities - In Order
A simple trick to remember Brazil's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Chile's Top 10 Cities - In Order
A simple trick to remember Chile's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise China's Top 10 Cities - In Order
A simple trick to remember China's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Colombia's Top 10 Cities - In Order
A simple trick to remember Colombia's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Egypt's Top 10 Cities - In Order
A simple trick to remember Egypt's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise France's Top 10 Cities - In Order
A simple trick to remember France's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Germany's Top 10 Cities - In Order
A simple trick to remember Germany's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise India's Top 10 Cities - In Order
A simple trick to remember India's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Indonesia's Top 10 Cities - In Order
A simple trick to remember Indonesia's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Iraq's Top 10 Cities - In Order
A simple trick to remember Iraq's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Italy's Top 10 Cities - In Order
A simple trick to remember Italy's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Japan's Top 10 Cities - In Order
A simple trick to remember Japan's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Kazakhstan's Top 10 Cities - In Order
A simple trick to remember Kazakhstan's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Mexico's Top 10 Cities - In Order
A simple trick to remember Mexico's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Morocco's Top 10 Cities - In Order
A simple trick to remember Morocco's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise North Korea's Top 10 Cities - In Order
A simple trick to remember North Korea's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Peru's Top 10 Cities - In Order
A simple trick to remember Peru's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Poland's Top 10 Cities - In Order
A simple trick to remember Poland's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Russia's Top 10 Cities - In Order
A simple trick to remember Russia's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Saudi Arabia's Top 10 Cities - In Order
A simple trick to remember Saudi Arabia's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise South Korea's Top 10 Cities - In Order
A simple trick to remember South Korea's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Spain's Top 10 Cities - In Order
A simple trick to remember Spain's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Sudan's Top 10 Cities - In Order
A simple trick to remember Sudan's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Sweden's Top 10 Cities - In Order
A simple trick to remember Sweden's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Thailand's Top 10 Cities - In Order
A simple trick to remember Thailand's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Turkey's Top 10 Cities - In Order
A simple trick to remember Turkey's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise UK's Top 10 Cities - In Order
A simple trick to remember UK's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Ukraine's Top 10 Cities - In Order
A simple trick to remember Ukraine's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise United States's Top 10 Cities - In Order
A simple trick to remember United States's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise World's Top 10 Cities - In Order
A simple trick to remember World's 10 largest cities in order and place them on a map. Takes 5 minutes.
Memorise Brazil's Top 10 Lakes - In Order
A simple trick to remember Brazil's 10 largest lakes in order and place them on a map. Takes 5 minutes.
Memorise China's Top 10 Lakes - In Order
A simple trick to remember China's 10 largest lakes in order and place them on a map. Takes 5 minutes.
Memorise Egypt's Top 10 Lakes - In Order
A simple trick to remember Egypt's 10 largest lakes in order and place them on a map. Takes 5 minutes.
Memorise France's Top 10 Lakes - In Order
A simple trick to remember France's 10 largest lakes in order and place them on a map. Takes 5 minutes.
Memorise India's Top 10 Lakes - In Order
A simple trick to remember India's 10 largest lakes in order and place them on a map. Takes 5 minutes.
Memorise Japan's Top 10 Lakes - In Order
A simple trick to remember Japan's 10 largest lakes in order and place them on a map. Takes 5 minutes.
Memorise Russia's Top 10 Lakes - In Order
A simple trick to remember Russia's 10 largest lakes in order and place them on a map. Takes 5 minutes.
Memorise UK's Top 10 Lakes - In Order
A simple trick to remember UK's 10 largest lakes in order and place them on a map. Takes 5 minutes.
Memorise United States's Top 10 Lakes - In Order
A simple trick to remember United States's 10 largest lakes in order and place them on a map. Takes 5 minutes.
Memorise World's Top 10 Lakes - In Order
A simple trick to remember World's 10 largest lakes in order and place them on a map. Takes 5 minutes.
Memorise Argentina's Top 10 Mountains - In Order
A simple trick to remember Argentina's 10 highest mountains in order and place them on a map. Takes 5 minutes.
Memorise Brazil's Top 10 Mountains - In Order
A simple trick to remember Brazil's 10 highest mountains in order and place them on a map. Takes 5 minutes.
Memorise China's Top 10 Mountains - In Order
A simple trick to remember China's 10 highest mountains in order and place them on a map. Takes 5 minutes.
Memorise Egypt's Top 10 Mountains - In Order
A simple trick to remember Egypt's 10 highest mountains in order and place them on a map. Takes 5 minutes.
Memorise France's Top 10 Mountains - In Order
A simple trick to remember France's 10 highest mountains in order and place them on a map. Takes 5 minutes.
Memorise Germany's Top 10 Mountains - In Order
A simple trick to remember Germany's 10 highest mountains in order and place them on a map. Takes 5 minutes.
Memorise India's Top 10 Mountains - In Order
A simple trick to remember India's 10 highest mountains in order and place them on a map. Takes 5 minutes.
Memorise Indonesia's Top 10 Mountains - In Order
A simple trick to remember Indonesia's 10 highest mountains in order and place them on a map. Takes 5 minutes.
Memorise Italy's Top 10 Mountains - In Order
A simple trick to remember Italy's 10 highest mountains in order and place them on a map. Takes 5 minutes.
Memorise Japan's Top 10 Mountains - In Order
A simple trick to remember Japan's 10 highest mountains in order and place them on a map. Takes 5 minutes.
Memorise Mexico's Top 10 Mountains - In Order
A simple trick to remember Mexico's 10 highest mountains in order and place them on a map. Takes 5 minutes.
Memorise Peru's Top 10 Mountains - In Order
A simple trick to remember Peru's 10 highest mountains in order and place them on a map. Takes 5 minutes.
Memorise Russia's Top 10 Mountains - In Order
A simple trick to remember Russia's 10 highest mountains in order and place them on a map. Takes 5 minutes.
Memorise Spain's Top 10 Mountains - In Order
A simple trick to remember Spain's 10 highest mountains in order and place them on a map. Takes 5 minutes.
Memorise Turkey's Top 10 Mountains - In Order
A simple trick to remember Turkey's 10 highest mountains in order and place them on a map. Takes 5 minutes.
Memorise UK's Top 10 Mountains - In Order
A simple trick to remember UK's 10 highest mountains in order and place them on a map. Takes 5 minutes.
Memorise United States's Top 10 Mountains - In Order
A simple trick to remember United States's 10 highest mountains in order and place them on a map. Takes 5 minutes.
Memorise World's Top 10 Mountains - In Order
A simple trick to remember World's 10 highest mountains in order and place them on a map. Takes 5 minutes.
Memorise Argentina's Top 10 Rivers - In Order
A simple trick to remember Argentina's 10 longest rivers in order and place them on a map. Takes 5 minutes.
Memorise Brazil's Top 10 Rivers - In Order
A simple trick to remember Brazil's 10 longest rivers in order and place them on a map. Takes 5 minutes.
Memorise China's Top 10 Rivers - In Order
A simple trick to remember China's 10 longest rivers in order and place them on a map. Takes 5 minutes.
Memorise Egypt's Top 10 Rivers - In Order
A simple trick to remember Egypt's 10 longest rivers in order and place them on a map. Takes 5 minutes.
Memorise France's Top 10 Rivers - In Order
A simple trick to remember France's 10 longest rivers in order and place them on a map. Takes 5 minutes.
Memorise India's Top 10 Rivers - In Order
A simple trick to remember India's 10 longest rivers in order and place them on a map. Takes 5 minutes.
Memorise Italy's Top 10 Rivers - In Order
A simple trick to remember Italy's 10 longest rivers in order and place them on a map. Takes 5 minutes.
Memorise Japan's Top 10 Rivers - In Order
A simple trick to remember Japan's 10 longest rivers in order and place them on a map. Takes 5 minutes.
Memorise Russia's Top 10 Rivers - In Order
A simple trick to remember Russia's 10 longest rivers in order and place them on a map. Takes 5 minutes.
Memorise UK's Top 10 Rivers - In Order
A simple trick to remember UK's 10 longest rivers in order and place them on a map. Takes 5 minutes.
Memorise United States's Top 10 Rivers - In Order
A simple trick to remember United States's 10 longest rivers in order and place them on a map. Takes 5 minutes.
Memorise World's Top 10 Rivers - In Order
A simple trick to remember World's 10 longest rivers in order and place them on a map. Takes 5 minutes.
Memorise the Lakes of Turkey
Learn the 2 lakes of Turkey the game uses, in order, with one mnemonic phrase and a map step for each.
Memorise the Mountains of Sudan
Learn the 2 mountains of Sudan the game uses, in order, with one mnemonic phrase and a map step for each.
Memorise the Rivers of Bangladesh
Learn the 2 rivers of Bangladesh the game uses, in order, with one mnemonic phrase and a map step for each.
Memorise the Rivers of Turkey
Learn the 2 rivers of Turkey the game uses, in order, with one mnemonic phrase and a map step for each.
Memorise the Rivers of Spain
Learn the 3 rivers of Spain the game uses, in order, with one mnemonic phrase and a map step for each.
Memorise the Lakes of Mexico
Learn the 4 lakes of Mexico the game uses, in order, with one mnemonic phrase and a map step for each.
Memorise the Mountains of Morocco
Learn the 4 mountains of Morocco the game uses, in order, with one mnemonic phrase and a map step for each.
Memorise the Rivers of Germany
Learn the 4 rivers of Germany the game uses, in order, with one mnemonic phrase and a map step for each.
Memorise the Lakes of Argentina
Learn the 5 lakes of Argentina the game uses, in order, with one mnemonic phrase and a map step for each.
Memorise the Rivers of Peru
Learn the 5 rivers of Peru the game uses, in order, with one mnemonic phrase and a map step for each.
Memorise the Rivers of Sudan
Learn the 5 rivers of Sudan the game uses, in order, with one mnemonic phrase and a map step for each.
Memorise Iraq's Top 6 Rivers - In Order
A simple trick to remember Iraq's 6 longest rivers in order and place them on a map. Takes 5 minutes.
Memorise Colombia's Top 7 Rivers - In Order
A simple trick to remember Colombia's 7 longest rivers in order and place them on a map. Takes 5 minutes.
Memorise Indonesia's Top 7 Rivers - In Order
A simple trick to remember Indonesia's 7 longest rivers in order and place them on a map. Takes 5 minutes.
Memorise Mexico's Top 7 Rivers - In Order
A simple trick to remember Mexico's 7 longest rivers in order and place them on a map. Takes 5 minutes.
Memorise Colombia's Top 8 Mountains - In Order
A simple trick to remember Colombia's 8 highest mountains in order and place them on a map. Takes 5 minutes.
Bank Holidays Across 50 Countries · Work Cultures
How public-holiday counts differ from country to country · from Japan's 16 to the UK's 8. The history behind the gap and why it matters for global teams.
The History of Red Days on Calendars
Why public holidays appear in red on calendars · how Sweden, Russia, China, and others adopted the convention. Includes a free Red Day Match game.
Lunar vs Solar · Why Ramadan and Easter Move
The calendar mechanics behind moving holidays · how the Islamic, Hebrew, and Christian calendars compute Ramadan, Passover, and Easter.
Cosmology's Century: Ten Big Discoveries
Ten new history rows for PlayMemorize: Leavitt's Cepheids (1912) through the first image of a black hole (2019). Each entry is a single citable year.
All Attention Training Games on PlayMemorize
Stroop, Ghost, Color, Backwards, and Spot the Difference · the twelve PlayMemorize games that train selective and sustained attention.
All Auditory Training Games on PlayMemorize
Music Lab · tones mode · the PlayMemorize game that trains your ears with melody, pitch, and tonal sequence memory.
All Classic IQ-Test Games on PlayMemorize
Raven matrices, mental rotation, Stroop, analogies, and more · the nine PlayMemorize games that mirror the tests psychologists use.
All Deduction Games on PlayMemorize
Sudoku, mine-flagging, code-cracking, mate-in-one, and riddles · the nine PlayMemorize games that train pure deductive reasoning.
All Estimation Games on PlayMemorize
Order-of-magnitude thinking · the three PlayMemorize games that train you to pick the right ballpark when exact numbers are unavailable.
All History Games on PlayMemorize
Order events, pin years, and attribute deeds · the three PlayMemorize games that build a working sense of history.
All Knowledge Games on PlayMemorize
Geography, languages, units, history, vocabulary, sizes, and dates · the seventeen PlayMemorize games that build general knowledge.
All Language Games on PlayMemorize
Vocabulary, definitions, reverse-reading, and analogies · the four PlayMemorize games that train your language brain.
All Memory Games on PlayMemorize
Pi digits, emoji cards, color sequences, music tones, and Kim's Game grids · the seven games that train working and visual memory.
All No-Reading Games on PlayMemorize
Pure visual and audio puzzles · the PlayMemorize games that play in any language with zero text. Includes Spot the Difference and emoji compare.
All Number Games on PlayMemorize
Arithmetic, units, sequences, sudoku, comparisons, and pi · the six PlayMemorize games that train numerical fluency.
All Ordering Games on PlayMemorize
Numbers in sequence, history in order, and items by size · the three PlayMemorize games that train ordering skill.
All Pattern Recognition Games on PlayMemorize
Number sequences, matrix grids, classification, rotation, and code-breaking · the nine PlayMemorize games that train pattern recognition.
All Reasoning Games on PlayMemorize
Pattern, deduction, abstraction, and verbal logic · the twenty PlayMemorize games that train the reasoning brain.
All Sequence Memory Games on PlayMemorize
Pi digits, colour sequences, tonal melodies, and number patterns · the four PlayMemorize games that train sequential memory.
All Spatial Reasoning Games on PlayMemorize
Mental rotation, mapping, board geometry · the nine games on PlayMemorize that train your spatial brain.
All Speed-Reaction Games on PlayMemorize
Math under pressure, Stroop response time, vocabulary sprints, and reverse-reading clocks · the ten PlayMemorize games that train cognitive speed.
All Trivia Games on PlayMemorize
Geography, facts, history, and rankings · the twelve PlayMemorize games that build pub-quiz general knowledge.
All Verbal Reasoning Games on PlayMemorize
Analogies, definitions, riddles, and vocabulary · the eleven PlayMemorize games that train verbal reasoning.
All Visual Games on PlayMemorize
Eyes-and-image puzzles · the thirteen PlayMemorize games where the answer lives in what you see, not what you read.
Crewed Spaceflight Firsts · Voskhod 2 to Crew Dragon
Voskhod 2, Salyut 1, STS-1, STS-7, Shenzhou 5, and Crew Dragon Demo-2: six new crewed spaceflight firsts now in PlayMemorize and the years they happened.
Why I Built PlayMemorize
The story behind PlayMemorize - why I created a free collection of browser-based memory training games for everyone.
How to Master Emoji Memory Games: A Complete Guide
A complete guide to mastering emoji memory card games using cognitive science: dual-coding, memory palaces, grid systems, chaining, and chunking.
Master Your Visual Memory: Twemoji Ghost
A complete guide to the Twemoji Ghost game on PlayMemorize, with proven mnemonic strategies to train your short-term visual memory.
Fast-Track Your Vocabulary: Twemoji Polyglot
A complete guide to the Twemoji Polyglot game on PlayMemorize, with proven techniques to build foreign vocabulary through direct visual association.
Memorise the First 10 Digits of Pi
Learn to memorise the first 10 digits of pi using the Major System - vivid stories, one pair at a time.
Memorise the First 50 Digits of Pi
Learn to memorise the first 50 digits of pi using the Major System - vivid stories, one pair at a time.
Memorise the First 100 Digits of Pi
Learn to memorise the first 100 digits of pi using the Major System - vivid stories, one pair at a time.
What is Apéry's Constant?
ζ(3) ≈ 1.20205. The sum of 1/n³, proved irrational in 1978 in a proof that astonished mathematicians. Whether it has a closed form involving π remains unknown.
What is the Basel Problem?
π²/6 ≈ 1.6449. Euler's 1734 proof that 1+1/4+1/9+1/16+⋯ = π²/6. The first time π appeared in a sum of fractions, linking the circle constant to number theory.
What is Catalan's Constant?
G ≈ 0.91597. The alternating sum 1−1/9+1/25−⋯. One of the most famous constants whose irrationality remains unproven.
What is the Champernowne Constant?
C₁₀ = 0.12345678910111213... The number built by writing every integer in sequence. Champernowne proved it is normal in base 10, making it the first.
What are Complex Numbers?
Complex numbers extend the real line into a plane. i = sqrt(-1). Every polynomial has a root. The foundation of quantum mechanics and Euler's identity.
What are Continued Fractions?
x = a0 + 1/(a1 + 1/(a2+...)). The most precise way to approximate irrationals with rationals. Pi = [3;7,15,1,292...], phi = [1;1,1,1,...], sqrt(2) = [1;2,2,2,...].
What is Conway's Constant?
λ ≈ 1.3035. The unique growth rate of all look-and-say sequences except for one degenerate case. Proved universal by John Conway's Cosmological Theorem in 1986.
What is De Moivre's Theorem?
(cosθ + i sinθ)ⁿ = cos nθ + i sin nθ. De Moivre's Theorem links complex numbers to trigonometry, making nth roots of complex numbers and angle.
What is e (Euler's Number)?
e ≈ 2.71828. The only number whose rate of growth always equals its current value. The base of natural logarithms and the foundation of continuous mathematics.
What is the Erdos-Borwein Constant?
E ≈ 1.6066. The sum of reciprocals of Mersenne numbers. Paul Erdős proved it irrational in 1948 using the binary representations of powers of 2.
What is Euler's Identity?
e^(iπ) + 1 = 0. Five fundamental constants in one equation. Discovered by Euler in 1748. Voted the most beautiful equation in mathematics in multiple surveys.
What is Feigenbaum Constant?
δ ≈ 4.66920. The universal ratio at which period-doubling routes to chaos. Mitchell Feigenbaum discovered it in 1975 using a hand calculator. It appears.
What are Fibonacci Numbers?
Each number is the sum of the two before it: 1, 1, 2, 3, 5, 8, 13... The ratios converge to the golden ratio. They appear in sunflowers, shells, and Pascal's triangle.
What is the Four Colour Theorem?
Any map can be coloured using only 4 colours so no two adjacent regions share a colour. Posed in 1852 and proved in 1976 using computer verification of.
What is the Fundamental Theorem of Calculus?
Differentiation and integration are inverse operations. Newton and Leibniz discovered this independently in the 17th century. The theorem that makes.
What is the Euler-Mascheroni Constant (γ)?
γ ≈ 0.57721. The constant gap between the harmonic series and the natural logarithm. Proved to exist, but never proved irrational.
What is the Gaussian Integral?
∫₋∞^∞ e^(−x²) dx = √π. The area under the bell curve is exactly the square root of π. The foundation of probability, statistics, and quantum mechanics.
What is Gelfond's Constant?
e^π ≈ 23.14069. Proved transcendental in 1934. Solves Hilbert's 7th problem. Equal to (−1)^(−i). The numerical coincidence e^π − π ≈ 20 has no known.
What is Golden Angle?
≈ 137.507°. The angle between successive leaves on a stem that gives the most efficient packing. Derived from the golden ratio. Explains why sunflower.
What is the Harmonic Series?
1 + 1/2 + 1/3 + 1/4 + ... diverges, absurdly slowly. Over 10^43 terms to exceed 100. Gateway to the Euler-Mascheroni constant and Riemann zeta.
What is Infinity?
Not all infinities are equal. Cantor proved the real numbers are strictly larger than the integers. Aleph-null, the continuum, and Hilbert's Hotel explained.
What are Irrational Numbers?
Numbers that cannot be written as fractions. sqrt(2), pi, e and phi are all irrational. The 2500-year-old proof and why irrationals outnumber rationals.
What is Khinchin's Constant?
K₀ ≈ 2.68545. For almost every real number, the geometric mean of its continued fraction coefficients converges to K₀. One of the strangest universal.
What is Lévy's Constant?
β = π²/(12 ln 2) ≈ 1.18656. For almost every real number, the nth convergent denominator grows as (e^β)ⁿ ≈ 3.276ⁿ. The universal growth rate of rational.
What is Liouville's Constant?
L = 0.110001000000000000000001… The first number ever proved transcendental, constructed in 1844 by placing 1s at every n! decimal position.
What is ln 2 (Natural Logarithm of 2)?
ln 2 ≈ 0.69314. The time for continuous growth to double. The half-life constant. Appears in information theory, radioactive decay, and the alternating.
What is the Major System?
The Major System maps digits to consonant sounds so you can build vivid words for any number. Explained with interactive examples and pi encoding.
What is the Meissel-Mertens Constant?
M ≈ 0.26149. The precise gap between the sum of prime reciprocals and ln(ln(n)). The prime analogue of the Euler-Mascheroni constant. Irrationality unknown.
What is Modular Arithmetic?
Clock arithmetic: 17 mod 12 = 5. The mathematics behind RSA encryption, hash functions, error-correcting codes, and Fermat's Little Theorem.
Number Systems
N inside Z inside Q inside R inside C. Each extension solves an equation the previous system could not. The complete hierarchy of number systems.
What is the Omega Constant?
Ω ≈ 0.56714. The unique real solution to Ωe^Ω = 1. Defined by the Lambert W function. Transcendental and deeply connected to e.
What are Perfect Numbers?
A perfect number equals the sum of its proper divisors: 6 = 1+2+3, 28 = 1+2+4+7+14. Every known perfect number is even. Whether odd perfect numbers exist is unsolved.
What is the Golden Ratio (φ)?
φ ≈ 1.61803. The ratio where the whole is to the larger part as the larger part is to the smaller. Found in pentagons, Fibonacci numbers, and the most.
What is Pi (π)?
pi is the ratio of a circle's circumference to its diameter: 3.14159... Irrational, transcendental, and infinite. History, formulas, and its digits.
What is the Plastic Number?
ρ ≈ 1.32471. The real root of x³ = x + 1. The limiting ratio of the Padovan sequence. Used in architecture by Hans van der Laan. The smallest Pisot number.
What is the Prime Number Theorem?
π(n) ~ n/ln(n). The number of primes up to n is approximately n divided by its natural logarithm. The fundamental law governing how primes thin out as.
What are Prime Numbers?
Primes are integers greater than 1 divisible only by 1 and themselves. Every integer has a unique prime factorisation. There are infinitely many primes.
What is the Pythagorean Theorem?
a² + b² = c². In any right triangle, the squares on the two legs sum to the square on the hypotenuse. Known since 1900 BC. Over 370 proofs discovered.
What is Ramanujan's Constant?
e^(π√163) ≈ 262537412640768743.999999999999. Almost a whole number by a miracle of mathematics.
What is the Riemann Zeta Function?
ζ(s) = 1 + 1/2ˢ + 1/3ˢ + ⋯ The most important function in mathematics. Its zeros control prime distribution. The Riemann Hypothesis: all zeros on.
What is the Silver Ratio?
δₛ = 1 + √2 ≈ 2.41421. The golden ratio of octagons. The limit of Pell number ratios. Satisfies x² = 2x + 1 and has continued fraction [2; 2, 2, 2, …].
What is √2 (Square Root of 2)?
√2 ≈ 1.41421. The diagonal of a unit square. The first number proved irrational, by the Pythagoreans around 500 BC.
What is Stirling's Approximation?
n! ≈ √(2πn)(n/e)ⁿ. An extraordinarily accurate formula for large factorials that unites π and e in a counting formula. Under 1% error for n=10, under 0.1%.
What is τ (Tau)?
τ = 2π ≈ 6.28318. One full revolution in radians. The circle constant that makes fractions of turns intuitive: a quarter turn is τ/4, a half turn is τ/2.
What is the Taylor Series?
f(x) = Σ f⁽ⁿ⁾(a)/n! · (x-a)ⁿ. Any smooth function written as an infinite polynomial. The foundation of all numerical computation. Explains why sin, cos,.
What are Transcendental Numbers?
Numbers that satisfy no polynomial equation with integer coefficients. Pi was proved transcendental in 1882, settling the ancient squaring-the-circle problem.
What is the Tribonacci Constant?
T ≈ 1.83929. The limiting ratio of the Tribonacci sequence, where each term is the sum of the three preceding terms. A three-term analogue of the golden ratio.
What is Twin Prime Constant?
C₂ ≈ 0.66016. Governs the density of twin prime pairs like (11,13) and (17,19). Tied to one of maths' great unsolved problems.
What is the Wallis Product?
π/2 = (2/1)·(2/3)·(4/3)·(4/5)·(6/5)·(6/7)⋯ Pi from pure multiplication of fractions. One of the most beautiful and surprising results in mathematics,.
