🧮 Calcudoku

Calcudoku combines Latin-square rules with arithmetic cages. Each row and column needs 1–n once each, and every outlined cage must produce its target number using its operation.

How to play

1. Tap a cell and enter a digit.
2. Cages show a target and an operation, e.g. 6× or 3−.
3. Satisfy every cage without repeating digits in any row or column.

Strategy tips

• Single-cell cages are free digits — place them first.
• Subtraction and division cages are the most restrictive: a two-cell 3− cage means digits that differ by exactly 3.
• A digit cannot repeat inside a cage when its cells share a row or column — use that to shrink options fast.

FAQ

Can a cage repeat digits?

Digits may repeat inside a cage only when the cells share no row or column — most cages forbid it anyway.

Is Calcudoku the same as Killer Sudoku?

Close cousins — Calcudoku uses all four operations and no 3×3 boxes; Killer uses sums inside a Sudoku grid.

How are cages labelled?

Each cage shows its target and operation, like 6× or 3−.

Difficulty affects grid size and time is your score — finish fast, post to the daily leaderboard, or race a friend.

All puzzles