Shikaku — Rectangle Logic Puzzle
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What is Shikaku?
Shikaku is a Japanese logic puzzle where you divide a grid into non-overlapping rectangles. Each rectangle must contain exactly one number, and the rectangle's area must equal that number. Every puzzle has a unique solution reachable by pure logic — no guessing needed.
Features
- 40 free puzzles across Easy, Medium, Hard, and Extreme
- Infinite puzzle generation with optional unlock
- 7 difficulty tiers from 5×7 to 21×24 grids
- Hint system, undo/redo, personal best times
- No account required — progress saved in your browser
- Fully playable on desktop and mobile
Learn how to play →