Get started

Interactive tutorial5 stepsPoints and rankingThe 4th rule2 minWhy it feels deeper2 minFour reasons to play2 minTsuidoku vs sudoku2 minColor sudoku, explained3 minTraining plan2 min

Techniques

The 81 unique pairs4 minRainbow technique2 minChromatic circle2 min

By level

Difficulty guide3 minEasy · 88 cluesMedium · 75 cluesHard · 62 cluesExpert · 52 cluesMaster · 43 cluesDiabolic · 36 clues

Understand

13 clues are enough7 min3.6 billion grids8 minThe CP-SAT solver6 minQuestions and answers2 minThe mathematics behind the gridTrain your brain
New · Easy level guideAll guides →
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