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15×15 Shikaku puzzles
At 15×15 (225 cells), Shikaku becomes a real campaign. You will work region by region, and the satisfaction of watching the board fill with colour is hard to beat.
0 rectangles · Drag to draw · Tap a rectangle to erase · Ctrl+Z undo · H hint
Solving a 15×15 Shikaku
- Split the board into regions mentally and finish one before moving on.
- Areas add up: if a closed-off region has 12 cells, its numbers must sum to 12.
- Use pause freely — progress and time are saved.
New to the puzzle? Read how to play Shikaku and then the strategy guide.
15×15 Shikaku questions
How long does a 15×15 Shikaku take?
Most players finish a 15×15 Shikaku in about 15–30 minutes, depending on the difficulty level and experience. Your personal best and average times are saved in your browser.
How many numbers are in a 15×15 Shikaku?
It depends on the level. Easy puzzles use more, smaller rectangles; Hard puzzles use fewer, larger ones. Whatever the count, the numbers always add up to 225, the total number of cells.
Is every 15×15 puzzle solvable without guessing?
Yes. Every puzzle has exactly one solution, verified by our solver. Easy puzzles need only basic deductions; Hard puzzles may need longer chains of reasoning, but never a lucky guess.