Calcudoku · how to play
Arithmetic meets Sudoku.
01
The rules
- Fill the N×N grid with digits 1 through N.
- No digit repeats in any row or column (Latin square).
- Cells are grouped into cages (outlined regions). Each cage has an operation (+, −, ×, ÷) and a target.
- The cage’s digits combined with its operation must produce the target.
02
How to play here
Tap a cell, then tap a digit (1–N) on the pad below. Duplicates in a row/column highlight red. Match all cage targets with a valid Latin square to win.
03
A starting tip
Start with single-cell cages — they’re free givens. Then look for 2-cell cages with division or subtraction: these have very few options (e.g. a “2÷” cage in a 4×4 means the pair is 4,2 or 2,1).
Interactive
Solve a mini Calcudoku together
Step 1/4:Cell 1 has a single-cell cage showing "2=" — it IS the answer. It's already showing if you tap it and enter 2.
Single-cell cages are free givens!
Fill 1–3 per row & column · cages must satisfy their target · re-enter a digit to clear it
Next: Calcudoku strategiesSingle-cell cages · Small division and subtraction cages · Addition cages as sum constraints — solve faster, never guess.