Sudoku was the training.
Suirodoku is the real game.
What is Suirodoku?
Suirodoku is a free online color sudoku game that merges numbers and colors into a single puzzle. Each cell combines a number (1-9) and a color (among 9), creating an entirely new brain training experience where both dimensions are intertwined. This innovative logic puzzle creates 81 unique number-color pairs.
4 Rules, 1 Ultimate Challenge
Suirodoku adds a revolutionary 4th dimension to classic Sudoku:
- Each row contains numbers 1-9 and all 9 colors
- Each column contains numbers 1-9 and all 9 colors
- Each 3×3 region contains numbers 1-9 and all 9 colors
- Each color contains numbers 1-9 (the 4th rule!)
81 Unique Pairs
Unlike traditional Sudoku where each number appears 9 times, Suirodoku guarantees that each number-color combination is unique. A completed grid is a harmonious work with no repetition - the ultimate logic puzzle challenge.
81 cells.
81 combinations.
0 duplicates.
1 solution.
Exclusive Techniques
Master advanced sudoku strategies that exist nowhere else:
Rainbow Technique
Track each number across all 9 colors to identify the missing color. The number reveals the color.
A revolutionary sudoku solving strategy.
Learn more →
Chromatic Circle
Track each color across all 9 numbers to identify the missing number. The color reveals the number.
An advanced brain training method.
Learn more →
Sudoku vs Suirodoku
Sudoku
- 3 constraints
- Numbers only
- Each number repeated 9 times
- Classic techniques
Suirodoku
- 4 constraints (+ colors)
- Numbers AND colors intertwined
- 81 unique pairs
- Exclusive techniques
Frequently Asked Questions
What is Suirodoku?
Suirodoku is a color sudoku where each cell combines a number (1-9) and a color (9 colors), creating 81 unique number-color pairs.
What are the rules of Suirodoku?
Like Sudoku, each row/column/3×3 region must contain numbers 1-9. In addition, each row/column/region must contain all 9 colors, and each color must contain numbers 1-9.
Is Suirodoku free to play?
Yes. You can play Suirodoku for free online in your browser.
What are Rainbow and Chromatic Circle techniques?
Rainbow tracks a number across all 9 colors to find the missing color. Chromatic Circle tracks a color across all 9 numbers to find the missing number.