Color Sudoku Online
Sudoku without the numbers: a full 9×9 board with nine colors in place of one to nine. It plays in your browser on a phone, a tablet, or a computer.
How to play
The rules are the same as classic sudoku. Every row, column, and block must contain all nine bubble colors. Each color appears exactly once, with no repeats. Some bubbles are already placed as clues, and you fill every empty cell to finish the puzzle.
Tap an empty cell, then tap a color to place it. Notes let you mark the colors a cell could still hold. The interactive tutorial shows it all on a real board in about two minutes, and the rules page has every rule on one page.
The nine colors
The colors do the job the numbers one to nine do in a classic sudoku. They have no order and no value. All that matters is whether two bubbles match.
What’s in the game
- Four levels. Easy, Medium, Hard, and Expert, each with the techniques it asks for listed next to it.
- A daily puzzle. One new board each day, the same board for every player.
- Hints that teach. Tap Hint and the game names the technique behind the next move, then walks you through the reason one step at a time.
- Notes, Undo, and Erase. Mark possible colors, take back a move, or clear a cell.
- Colorblind Symbols. A setting that adds a distinct shape to every color.
A full-size board
Bubble Sudoku uses the full 9×9 board, the same size as a classic sudoku. So every classic technique works here, from Full House to X-Wing and Swordfish. The Techniques pages teach fifteen of them, animated step by step on real boards, and this guide lists what to try, in order, when you get stuck.
Now on iPhone and Android
Bubble Sudoku is on the App Store and Google Play. Every level and the daily puzzle also play right here in the browser.
Questions
Is color sudoku the same as regular sudoku?
Yes. The rules and the techniques are identical. Only the symbols change, from numbers to colors. Sudoku was never about math, so nothing is lost.
Is it free?
Yes. The browser game is free, with every level unlocked, including the daily puzzle.
Do I need an account?
No. Your scores and settings are saved in your browser, on your own device. A puzzle you leave before finishing isn’t kept.
What if I find some colors hard to tell apart?
Turn on Colorblind Symbols in Settings. Every color then also gets its own shape. See all nine shapes.