If you've solved hundreds of sudokus and nothing challenges you anymore β this is what's next. Not a variant. A new logic puzzle.
π― One extra rule changes everything
Classic sudoku: fill every row, column, and 3Γ3 box with 1β9. Tsuidoku adds a 4th rule β every color must also run 1 through 9.
The result: 81 unique number-color pairs, no two cells alike. Sudoku repeats each digit 9 times; Tsuidoku never repeats anything. Every grid you finish is one of a kind.
π§ A new way to think
Numbers help you place colors. Colors help you place numbers. You read the grid two ways at once β reasoning that's simply impossible in sudoku. Every classic technique still works, plus two you'll only learn here.
π Two modes
Practice β no timer, no pressure, your pace.
Ranked β every game feeds your rating and your rank on the global leaderboard.
π Compete worldwide
Winning streaks, best times, personal records, peak rating β track it all against players everywhere.
Add the 4th rule. See what sudoku becomes.
Sudoku was the warm-up. Tsuidoku is the real game.