Chess Sudoku

Chess Sudoku combines classic Sudoku rules with chess-inspired restrictions. You solve puzzles by placing digits so they do not repeat in a row, column or 3×3 box, while also following the rules of each variant.

Puzzle variants

The game includes Knight Sudoku and King Sudoku puzzles. In Knight Sudoku, a digit cannot appear a chess knight’s move away from itself. In King Sudoku, a digit cannot appear one diagonal move away from itself. The game features 40 puzzles across these two variants. Queen Sudoku puzzles are also described as a large free update: in this variant, each 9 acts like a chess queen and cannot share a row, column, 3×3 box or diagonal with another 9.

Hints and progression

Simon Anthony and Mark Goodliffe craft the hints, and every puzzle is play-tested by a person. Hints are designed to help you improve your solving skills. You start with zero stars and earn them by solving puzzles; earning more stars unlocks more puzzles. The puzzles range from easy to extreme, with difficulty calibrated to provide puzzles at every level. Further updates add new puzzles.