Calcudoku
Latin square with cage operations
Latin square with cage operations · +, −, ×, ÷
Goal
Fill the grid 1–N so every row and column has no repeats, and each cage matches its arithmetic clue.
Rules
- Each row and column contains 1–N exactly once (N is the grid size).
- Each cage shows a target and an operation (+, −, ×, ÷).
- The cage’s cells must combine with that operation to hit the target.
- A single-cell cage’s clue is simply its value.
How to play
- Solve single-cell cages first — they are free placements.
- For + and × cages, list the digit combinations that reach the target.
- Use row and column uniqueness to throw out impossible combinations.
Tip
Subtraction and division cages always have two cells — just test both orderings.
Techniques to learn
Naked Single · Hidden Single · Last Candidate · Single-Cell Cage · Naked Pair · Hidden Pair · Naked Triple · Hidden Triple · Naked Quad · Hidden Quad