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.

Logic Puzzles · Akari, Shikaku, Nurikabe & More

The Detective's Casebook

Six cases lie open on the desk. Pick one and crack it.

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