How to Play Calcudoku

THE PLAYBOOK · PT-BUS

How to play Calcudoku

PT-BUS presents Calcudoku with a practical playbook rather than a download screen. Fill a 4×4 Latin square and satisfy every cage arithmetic target. Read the careful restarts note before you begin.

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

Careful restarts

Start a fresh round when you want another attempt. Restarting may discard current progress; read the controls rather than assuming an account backup exists.

Your goal

Fill a 4×4 Latin square and satisfy every cage arithmetic target.

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.

A useful example

A two-cell 6× cage contains 2 and 3 in a 1–4 puzzle.

Watch out for this

A correct cage total does not permit duplicate digits in a row.

Common questions