Sudoku Games

Sudoku for every level — and every taste

Sudoku is the world's favourite logic puzzle: fill the grid so every row, column and box contains each digit exactly once. There is no maths involved in the classic game — just careful reasoning. Once you know the classic rules, the variants below add one new idea each, which changes how you think about the whole grid.

Every puzzle on Game Oix is generated fresh and checked by a solver to make sure it has exactly one solution, so you never need to guess.

Classic grids

• Classic Sudoku (9×9), Sudoku 6×6 and Mini Sudoku 4×4 — the standard rules at three sizes.

Sudoku variants

• Killer Sudoku and Mini Killer Sudoku 6×6 — dashed cages with sums replace most starting digits.
• Jigsaw Sudoku — irregular regions instead of square boxes.
• Diagonal Sudoku (Sudoku X) and Hyper Sudoku — the two diagonals, or four extra boxes, must also hold 1–9.
• Even-Odd Sudoku, Anti-Knight Sudoku and Consecutive Sudoku — extra rules about parity, knight moves and neighbouring digits.
• Greater-Than Sudoku and Sandwich Sudoku — inequality signs or "sandwich" sums give the clues.

Related number-placement puzzles

Futoshiki, Kakuro and Skyscrapers use the same "each number once" logic with inequality signs, cross sums and skyline views.

Features

Notes (pencil marks), undo, hints, conflict highlighting, pause and automatic saving of unfinished puzzles are available in the Sudoku games, with full keyboard support.

Daily challenge

The Daily Brain Challenge gives every player the same Medium Sudoku each day, with a streak counter.

Learn the techniques

Start with Sudoku Strategies for Beginners, then move on to Advanced Sudoku Techniques.