Kaku

About Kaku

Kaku is our take on Shikaku, the elegant Japanese rectangle-division puzzle. Split the grid into rectangles so that each one contains exactly one number — and that number equals the rectangle's area.

It is pure spatial logic: no guessing, no luck, every puzzle has exactly one solution you can reason your way to. Start with bite-sized boards and work up to grids that will really stretch your brain.

How to Play

1. Drag on the grid to draw a rectangle.
2. Each rectangle must contain exactly one number.
3. The number must equal the rectangle's area (width x height).
4. Cover the whole grid with no overlaps to solve the puzzle.

Features

• Classic Shikaku rules with a clean, modern board
• Every puzzle is verified to have a unique solution
• Difficulty from relaxing minis to expert grids
• Play free in your browser — coming to stores soon