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.
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.
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.
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.
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.