Logic Puzzles
Six grid constraint puzzles in one hub: Akari, Shikaku, Nurikabe, Slitherlink, Bridges, and Infinity Loop. Pick your puzzle
About PlayMemorize Logic Puzzles
Logic Puzzles brings together six classic Japanese pencil-puzzle formats in one place. Each format trains a different flavour of constraint-satisfaction reasoning · the ability to work through a set of rules and deduce the unique valid solution without guessing.
Six puzzle types. Akari · place light bulbs to illuminate every white cell; numbered walls constrain how many bulbs may touch them. Shikaku · divide the grid into rectangles, each containing exactly one number equal to its area. Nurikabe · shade cells black so numbered white islands are isolated and black cells form one connected group with no 2×2 block. Slitherlink · draw a single closed loop along grid edges; numbered cells say how many of their edges the loop uses. Bridges (Hashiwokakero) · connect islands with bridges so each island's count is satisfied and no bridges cross. Loop (Masyu / Infinity Loop) · route a loop through every cell following turning rules.
Why these puzzles? Each format is a textbook constraint-satisfaction problem. Solving them regularly builds logical deduction, pattern recognition, and the ability to reason about interdependent constraints · skills that transfer to programming, mathematics, and analytical thinking.
Streak format. Completing a puzzle correctly advances the streak; an invalid solution ends it. Difficulty controls grid size and the density of given clues.
Part of the PlayMemorize family of brain-training games. Runs entirely in your browser, works offline as a Progressive Web App.
FAQ
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What is Logic Puzzles?
A collection of six classic Japanese pencil-puzzle formats · Akari, Shikaku, Nurikabe, Slitherlink, Bridges (Hashiwokakero), and Loop. Each trains constraint-satisfaction reasoning. -
What are the six puzzle types?
Akari: place bulbs to illuminate every white cell. Shikaku: divide into rectangles matching numbered areas. Nurikabe: shade water cells to isolate white islands. Slitherlink: draw one closed loop. Bridges: connect islands with the right bridge count. Loop: route a loop obeying turning rules. -
Do I need to know Japanese to play?
No. The puzzles are fully localised. The rules are also geometric and self-contained · once you learn the rules once, the puzzle language does not matter. -
How does difficulty scale?
Easy difficulty uses small grids (5×5 to 7×7) with many clues given. Higher difficulty increases grid size and reduces given clues, requiring longer deduction chains and more backtracking resistance. -
How does my progress save?
Your best streak per puzzle type is stored locally in your browser. Sign in to sync it across devices. -
Can MemPi help me study and practice this game?
Yes! Click MemPi in the header or on the game board to summon him. He observes the board, thinks out loud, and can demonstrate moves or guide you through tricky steps.