How to Play Calcudoku

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How to play Calcudoku

Try Calcudoku at your own pace and keep its objective in view. Fill a 4×4 Latin square and satisfy every cage arithmetic target. Check the relevant rule before repeating a move. Begin with the solo mode shown on the page. Look at what changes after your first action.

Twelve puzzles with addition, multiplication, subtraction and singleton cages.

A useful comparison

Compare the worked example with your own position. Use the reasoning, not an answer copied from a different board. Use the example to check your reasoning.

Your goal

Fill a 4×4 Latin square and satisfy every cage arithmetic target. Read that aim before choosing your first action. Notice how the game responds to your input.

Step by step

1. Select a square and enter 1–4.
2. Combine all cage digits using its shown operation.
3. Subtraction uses the absolute difference.
4. Check puzzle verifies the entire grid.

Controls

Click or tap squares or graph edges. Number boards include a digit pad. Undo reverses the previous change; Check puzzle validates the solution. On a smaller screen, keep the active part of the board within view. Contact us with the game and device if a control does not respond.

A useful example

A two-cell 6× cage contains 2 and 3 in a 1–4 puzzle. Use the example as a guide rather than a substitute for reading your board. Notice the change in the playing area.

Watch out for this

A correct cage total does not permit duplicate digits in a row. A different version of the game may use a different rule. Keep the stated aim separate from side details such as animation or appearance. Progress is measured by the game’s own completion or scoring rules.

Common questions