Variadoku

Ten sudoku variants, generated on your device and free to play. The puzzles need JavaScript; the guides below don't.

How to play

Classic 9×9 Sudoku — Digits 1–9, one of each per row, column and box.
6×6 Sudoku — Smaller board: digits 1–6, boxes 3 wide and 2 tall.
Difference Sudoku — Circles mark neighbours whose digits differ by 1.
Irregular 6×6 Sudoku — Digits 1–6, with jigsaw regions instead of boxes.
Odd/Even Sudoku — Pink cells take odd digits, white cells even.
Relational 6×6 Sudoku — Every border says which neighbour is bigger.
Killer Sudoku — Cages of distinct digits that add up to a given total.
Windowed Sudoku — Outside numbers total the three nearest cells.
Triangle Sudoku — Triangular board, with lines in three directions.
Skyscraper Sudoku 5×5 — Digits are towers; clues count what you can see.

Today's daily puzzle · Free play: pick a difficulty