Color Sudoku Rules: How to Play a Color-Based Sudoku Variant
Learn how Color Sudoku works, how color regions replace or supplement numbers, and how to practice the same logic on classic Sudoku boards.
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Get the iPhone App →Color Sudoku is a Sudoku variant where colors act like symbols. Instead of thinking only about digits, you track which color can appear once in each row, column, box, or region.
The exact rules depend on the puzzle source. Some color Sudoku puzzles replace numbers with colors. Others add colored regions as an extra constraint on top of normal 1-9 Sudoku.
Play free Sudoku online on Pure Sudoku.
Basic Color Sudoku rules
- Each row can use each color once.
- Each column can use each color once.
- Each box or region can use each color once.
- If numbers are also present, normal Sudoku rules still apply.
How to solve Color Sudoku
- Treat colors like digits or symbols.
- Scan rows, columns, and boxes for missing colors.
- Look for colors that have only one possible square in a unit.
- Use notes if the puzzle also includes numbers or extra regions.
Practice path
If Color Sudoku feels confusing, practice classic Sudoku first. The underlying logic is the same: eliminate impossible symbols until only one legal option remains.
FAQ
Is Color Sudoku math?
No. Like classic Sudoku, it is a logic puzzle. Colors are symbols.
Is Color Sudoku harder than normal Sudoku?
It can be, mostly because color constraints are less familiar than digits. The solving logic is similar.