Calcudoku Daily Math Cage Puzzle
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Setting up the board…
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How to play
- Use digits 1 to the grid size once in every row and column.
- Each outlined cage must reach its label using its operation.
- Subtract the smaller digit from the larger. Divide the larger by the smaller exactly.
- Digits may repeat inside a cage when they occupy different rows and columns.
Select a cell, then tap or type a digit. Use Notes, arrow keys, and Hint.
How to play Calcudoku, the daily math cage puzzle
Calcudoku is a math logic puzzle. Fill the grid so every row and column holds each digit once, from 1 up to the size of the grid. Outlined cages show a target and an operation: the digits in the cage must reach the target using it.
For subtraction and division, start from the larger digit. A digit may repeat inside a cage when the copies are in different rows and columns.
A new board goes live at midnight in your time zone, easy at the start of the week and hardest on Sunday.
Strategy tips
- Start with single cells. A one-cell cage gives you its digit straight away.
- Use division and subtraction cages. They allow few pairs. On a 4×4 grid, a 2÷ cage can only hold 1 and 2, or 2 and 4.
- Count what a row still needs. Each row adds up to the same total. Once most of a row is known, the rest is often forced.
- Ask for a hint. Hint picks a cell and explains why its digit must go there.
Frequently asked questions
- Do I need to guess?
- No. Every board has exactly one solution and can be solved by logic.
- How big are the grids?
- From 4×4 on Easy days up to 7×7 on Sundays.
- Can I write notes?
- Yes. Turn on Notes to pencil in the digits a cell could hold.
- Can I play more than one a day?
- Endless mode has unlimited calcudoku boards from Easy to Expert, and the archive keeps every past daily board. It is free, with no account.