How to play
Fill the grid so every row, column, and box holds each color exactly once. It’s plain sudoku in soft pastels — every tile shows its number too, so you can play by color, by number, or both.
- Tap an empty cell — a color palette pops up right there.
- Pick a color to drop it in; tap ✕ Erase to clear.
- No color may repeat in a row, column, or box.
Some cells start locked; color the rest. Clashing cells flash a red outline so mistakes are easy to catch. On a keyboard, use arrow keys to move and number keys to fill. Hit a wall? Undo a move, or tap 💡 to reveal one cell — three hints per puzzle.
Pick 6×6 (six colors, fast) or 9×9 (nine colors, classic) on the start screen.
Tips and strategy
- Scan one color at a time. Pick red, look where it already sits, and cross off every row, column, and box it blocks — often a box is left with just one legal spot. That’s a hidden single.
- Then flip the question. For a tricky cell, ask which single color its row, column, and box haven’t already used. Only that one fits — a naked single.
- Work the fullest rows and boxes first. Nearly full lines have the fewest choices, so they lock quickly and squeeze their neighbors.
- No guessing needed. Every puzzle has exactly one solution, reachable by pure logic.
No timer, no fail
There’s no clock and no way to lose. Pick a difficulty and take a quiet few minutes of color and deduction at your own pace.
FAQ
- Do I need to know numbers to play Color Sudoku?
- No. Every tile shows both a color and a number, so you can solve by color, by number, or both — whichever you find easier.
- What's the difference between 6×6 and 9×9?
- 6×6 uses six colors and solves fast; 9×9 uses nine colors for a classic, longer sudoku. You pick the size on the start screen.
- Is there any guessing in Color Sudoku?
- No. Every puzzle has exactly one solution reachable by pure logic, using techniques like hidden singles and naked singles.
- Is there a timer or a way to fail?
- No clock and no fail state — take a quiet few minutes at your own pace. Clashing cells simply flash a red outline so mistakes are easy to catch.