Detectives
Hidden state, episodic recall, and the geography of the case.
Investigation is a deduction game with episodic memory bolted on. The investigator who closes faster is the one whose hypothesis space narrows with each new fact, instead of widening.
Recommended games
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Detective Deduction
Eliminate suspects from scene clues, narrow down a secret number, or find a mystery character in a lineup
Detective DeductionOpen game Loading... -
Mastermind Deduce
Crack the secret code from past guesses and peg feedback. Pure deductive reasoning, cheat-proof validation
Mastermind DeduceOpen game Loading... -
Deduction
A few clues describe one secret number · cross out every option that breaks a clue and the one left standing is the answer
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Logical Fallacies
Spot the flaw in reasoning or match a famous fallacy to its definition
Logical FallaciesOpen game Loading... -
Flag a Mine
Flag the unrevealed cell that must be a mine. Constraint-satisfaction deduction, cheat-proof validation
Flag a MineOpen game Loading... -
Find Differences
Two emoji walls, K differences. Spot every altered cell on the bottom wall · 100 to 500 emojis, 1 to 20 differences
Find DifferencesOpen game Loading...
Why these games
Mastermind Deduce is the canonical hidden-state deduction drill. Memory Game keeps the case-detail buffer warm so the inconsistency in this interview pings against the last one. Spatial Rotation is the scene-and-route reconstruction drill.