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
- Drag on the grid to draw a rectangle.
- Each rectangle must contain exactly one number.
- The number must equal the rectangle's area (width x height).
- 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
