easy
5x5 grid with digits 1-5.
0 of 25 free easy Calcudoku puzzles used
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Calcudoku
Choose a difficulty
Fill every row and column with each digit once, while each cage satisfies its arithmetic target.
Today's editions
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medium
7x7 grid with digits 1-7.
0 of 25 free medium Calcudoku puzzles used
hard
9x9 grid with digits 1-9.
0 of 25 free hard Calcudoku puzzles used
From the rulebook
How to play Calcudoku
Calcudoku, better known to many solvers as KenKen or Mathdoku, combines Sudoku logic with arithmetic. Fill the grid so every row and every column contains each digit exactly once, while the digits in each outlined cage combine to hit the cage's target using the printed operation (+, −, × or ÷).
Single-cell cages are free digits, place those first. Then look for cages with few possible combinations: a two-cell “3÷” cage in a 6×6 grid can only be 1&3 or 2&6. Cross-reference cage candidates with the once-per-row- and-column rule, and the grid unravels. Bigger grids and division-heavy cages make the hard puzzles a genuine workout.