Daily Shikaku

How to play Shikaku

Shikaku gives you a grid scattered with numbers. Divide the whole grid into rectangles so that each rectangle contains exactly one number, and that number equals the rectangle's area (its width × height). Every cell ends up inside exactly one rectangle — no gaps, no overlaps.

THE RULES

1. Tap one corner cell, then the opposite corner, to draw a rectangle.
2. Each rectangle must contain exactly one number.
3. That number is the rectangle's area — a 6 is a 1×6, 2×3, etc.
4. Rectangles can't overlap; together they cover the whole grid.
5. Tap a rectangle you've drawn to clear it and try again.

BEGINNER STRATEGY

• Start with the 1s and primes. A 1 is its own cell; a prime like 5 can only be a 1×5 or 5×1, so its orientation is nearly forced.
• Watch the edges and corners. A number in a corner has far fewer ways to fit — pin those down first.
• Let neighbours constrain each other. Once one rectangle is placed, the cells it claims rule out shapes for the numbers beside it.
• Clear freely. A wrong rectangle costs nothing — tap it to remove it and try a different shape.

ABOUT THIS DAILY

Every visitor on the same UTC day gets the same grid, seeded from the date. Your progress is saved to this browser — close the tab and come back later. A new puzzle unlocks at midnight UTC. If you enjoy the puzzle, GridJoy on Google Play has 17 more puzzle types (Sudoku, Killer Sudoku, Kakuro, and more) plus a ghost companion that grows with you as you solve.