Color Sudoku

Sudoku with colours instead of numbers. Fill the 9×9 grid so every row, column and 3×3 box holds all nine colours exactly once. Same logic you know, a calmer and more visual way to play.

The idea behind Color Sudoku

Color Sudoku keeps the classic puzzle's logic intact and changes only what you look at. Instead of the digits 1 to 9, the nine symbols are nine distinct colours. That small change has a surprisingly large effect. The human eye reads colour faster than it reads the shapes of numbers, so clashes and patterns tend to jump out at a glance. Many people who find a grid of numbers a little intimidating relax immediately when the same puzzle is painted in colour. It is the same brain workout wearing friendlier clothes.

How it works

The rule is exactly the one you already know, applied to colour. Each row must contain all nine colours with none repeated, each column must do the same, and each 3×3 box must do the same. Pick a colour from the palette below the board, tap the cell you want, and it fills. Because the board is generated with a single unique solution, you can always reach the finish by logic alone, never by guessing.

Prefer numbers? Keep both

Colour and number are two views of one puzzle, and you can switch between them at will. Tap the 123 button to reveal the number sitting behind every colour, then hide them again once you have your bearings. This helps in two situations: when you are still learning which colour maps to which number, and when a pair of shades is hard for you to tell apart. Nothing about the puzzle changes, so you lose no challenge by turning the numbers on.

The solving logic is identical

Everything you have learned about classic Sudoku transfers directly. Look for a cell where eight of the nine colours already appear in its row, column and box, leaving only one possible colour. Hunt for a colour that can fit in just one cell of a box. Work the rows and boxes that are nearly complete first. The only adjustment is mental: you are tracking which colours are missing rather than which numbers, and after a few minutes that feels completely natural.

All the tools you expect

• Pencil notes appear as small coloured dots inside a cell, so you can mark the candidate colours before you commit, just like penciling numbers.
• Hint, undo, redo and erase all work exactly as in the number game.
• Three difficulty levels, a solve timer, and a fresh, unique board every time you start.
• Your progress is saved automatically, and the game follows the site's light or dark theme.

Tips for your first colour game

If colour is new to you as a solving symbol, a couple of habits make it click quickly. Learn the palette in order, so your eye always knows where each colour sits, and lean on the pencil-note dots early to keep your options visible. If two shades look close on your screen, tap the 123 button, place the tricky pair by number, then switch the colours back on. And treat a completed row, column or box as a checklist: nine colours, each one once, no exceptions. Within a few puzzles the colours stop feeling like a translation and start feeling like the natural language of the board.

Who it is for

Color Sudoku suits anyone who wants a gentler, more meditative version of the puzzle: newcomers testing the water, children learning the logic before they are quick with numbers, or seasoned solvers who simply enjoy the change of pace. If you like the visual angle, Flower Sudoku colours the board a different way, with jigsaw petal regions. For the classic experience, the number game is always a tap away at Sudoku AZ, and Killer Sudoku waits when you want a sterner test.