Variant playground

Sum Sudoku

Sum Sudoku uses Killer Sudoku cage totals to narrow candidates before filling the classic Sudoku grid.

Related Sudoku variants

These pages cover related formats and alternate names for this puzzle type.

Killer Sudoku Killer Sudoku combines classic regions with arithmetic cages. Use the cage totals to narrow candidates before placing digits. Sudoku X Sudoku X adds both long diagonals as extra regions, so every digit must appear once on each diagonal as well as in every row, column, and box. 6x6 Sudoku 6x6 Sudoku adds more variety while staying faster than a full 9x9 board. Sudoku Variants Browse Sudoku X, Killer Sudoku, Mini Sudoku, Samurai Sudoku, and related formats.