—SEC. 07 — Calcudoku

Calcudoku

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Calcudoku

MathDoku

www.mathdoku.com

Many free puzzles playable online, in three sizes: 4x4, 6x6, and 8x8, in three difficulty levels. Also has "no-op" puzzles (where the operator clue is not given).

Puzzles playable online, sizes 3x3 to 9x9, as well as tutorials and tips.

Added May 10, 2026