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How to play

Sudoku

3×3 blocks

Complete the grid so that every row, column and every three-by-three box contains the digits 1 to 9. Solve the puzzle by logic and reasoning alone.

Animation on the three rules to complete a Sudoku with numbers 1 to 9

Simple techniques Advanced techniques Play Sudoku

Samurai Sudoku

5-grid, 3×3 Sudoku variant

Complete the Samurai grid so that within each of the five 9×9 Sudokus, every row, column and three-by-three box contains the digits 1 to 9. You will always need to solve the puzzle as a whole, you cannot just solve each Sudoku individually.

Play Samurai Sudoku

Super Sudoku

4×4 blocks

Complete the grid so that every row, column and every four-by-four box contains all the digits 0 to 9 and the letters A to F. Solve the puzzle by logic and reasoning alone.

Play Super Sudoku

Godoku

3×3 blocks with hidden words

Complete the grid so that every row, column and every three-by-three box contains the nine different letters. Solve the puzzle by logic and reasoning alone.

Solve Godoku

Killer Sudoku

3×3 blocks with sums as clues

Complete the grid so that every row, column and every three-by-three box contains the digits 1 to 9. Each "cage" (region outlined by a dashed line) has a cage total of all numbers within that cage. Numbers may not be repeated within a cage. Solve the puzzle by logic and reasoning alone.

Simple techniques

Multiple 45 rule

Multiple square 45 rule

Play Killer Sudoku