Color Sudoku
The same puzzle, painted. Fill every row, column, and 3×3 box with one of each of the nine colors. Today’s grid — 2026-09-15.
More color puzzles
Same logic, no numbers
Color Sudoku is ordinary Sudoku with the digits 1 to 9 swapped for nine colors: Red, Orange, Yellow, Green, Blue, Indigo, Violet, White, and Rainbow. Every row, every column, and every 3×3 box must contain each color exactly once — identical rules, so all the same logic and the same Hint button apply. Pick a color from the palette, then tap a square.
Built to be playable for everyone
The board is pure color by default. Color-only puzzles are hard for the roughly 1 in 12 people with color-vision deficiency — and red and green, both in this set, are the classic hard-to-tell-apart pair. So there are three aids, all optional and stacking:
- Colorblind mode — the switch above the board swaps the palette for one drawn from the Okabe-Ito color set, chosen to stay distinguishable under red-green and blue-yellow color blindness, with varied lightness so the colors differ in brightness too. Your choice is remembered for next time.
- Labels on — overlays each color’s initial on every square; available in both palettes.
- The color key above stays on screen, and every square is named for screen readers.
You can also type the number keys 1–9 to place colors in the order shown in the legend.
Frequently asked questions
What is Color Sudoku?
It's ordinary Sudoku with the digits 1 to 9 swapped for nine colors — red, orange, yellow, green, blue, indigo, violet, white, and rainbow. Every row, every column, and every 3×3 box must contain each color exactly once, so all the usual Sudoku logic still applies.
Is Color Sudoku free to play?
Yes — completely free, no sign-up, nothing to install. A new puzzle is available daily, plus four difficulty levels whenever you want a different challenge.
Is there a colorblind-friendly version?
Yes. A switch above the board turns on colorblind mode, which swaps in a palette drawn from the Okabe-Ito color set — chosen to stay distinguishable under red-green and blue-yellow color blindness, with varied brightness so the colors also differ in lightness. Your choice is remembered for next time.
Can I show the color names on the tiles?
Yes. Turn on Labels to overlay each color's initial on every square — it works in both the standard and colorblind palettes, and the color key stays on screen the whole time.
How is it different from regular Sudoku?
Only the symbols change. The rules, the solving techniques, and the Hint button are identical to number Sudoku — some people just find colors more relaxing, or a fresh way to see the same puzzle.
Does it work on my phone?
Yes. Pick a color from the palette and tap a square; the board is mobile-friendly and needs nothing downloaded.