How to Play Calcudoku
Overview
Calcudoku (also known as KenKen or Mathdoku) combines the logic of Sudoku with arithmetic. Fill the grid so each row and column contains each digit exactly once, while satisfying the mathematical constraints in each cage.
Video Tutorial
Rules
- 1Fill each cell with a digit from 1 to N (where N is the grid size).
- 2Each row must contain each digit exactly once.
- 3Each column must contain each digit exactly once.
- 4Cells are grouped into cages with a target number and operation.
- 5Digits in each cage must combine using the operation to equal the target.
Operations
+
Addition: 7+ with [3,4] → 3+4=7
−
Subtraction: 2− with [5,3] → 5−3=2
×
Multiplication: 12× with [3,4] → 3×4=12
÷
Division: 2÷ with [6,3] → 6÷3=2
Controls
ClickSelect a cell
1-9 KeysEnter a digit
BackspaceClear selected cell
P KeyToggle pencil mode
Ctrl+ZUndo last move
Solving Strategies
Single-Cell Cages
A cage with one cell gives you a free digit!
Division is Restrictive
Division cages have limited options (e.g., 2÷ must be 2/1, 4/2, or 6/3).
Use Pencil Marks
Note possible candidates to track possibilities and eliminate options.
Cross-Reference
Check rows and columns together to find where a digit must go.