Mathdoku
Play Mathdoku free in your browser. Choose from four levels, Easy to Insane, and use notes, hints and the timer as you like. No download and no sign-up.
How to play Mathdoku
Mathdoku is a number puzzle that mixes logic with arithmetic. Fill the grid so that no digit repeats in any row or column. On a 6×6 grid you use the digits 1 to 6. The grid is divided into outlined groups of cells called cages. Each cage shows a target number and an operation, and the digits in that cage must reach the target using that operation.
- A cage marked 7+ must add up to 7. A cage marked 12× must multiply to 12.
- For subtraction and division the order does not matter. A 2− cage can hold 5 and 3 either way round.
- A digit can repeat inside a cage, as long as it is not in the same row or column.
- Tap a cell, then tap a digit to place it. Use Notes to mark possible digits, Hint when you are stuck and Erase to clear a cell.
Play on your Phone
Choose your level
- Easy: addition and multiplication only.
- Medium: all four operations.
- Hard: a 6×6 grid with all four operations.
- Insane: a 6×6 grid with very large cages.
Tips for beginners
- Fill single-cell cages first. A cage with one cell simply tells you its digit.
- Look for cages with one possible answer. On a 6×6 grid, two cells that add to 3 must be 1 and 2, and two cells that multiply to 30 must be 5 and 6.
- Use the row and column rule. Once a digit is placed, it cannot appear again in that row or column. This often settles which way round a pair goes.
- Remember the totals. Every row and column on a 6×6 grid adds up to 21. If you know five cells, the sixth is whatever is left.
- Break multiplication targets into factors. A cage that multiplies to 20 must contain a 5, because no other digits from 1 to 6 can make it.
- Use Notes. Mark every digit a cell could hold, then remove marks as the cells around it fill in.
- Don’t guess. A wrong digit can stay hidden for many moves. Re-check the cages, or use a hint.
- Our guide, How to solve Mathdoku: 5 beginner techniques, goes further.
FAQ
Is Mathdoku free? Yes. It is free to play in your browser, with no download or sign-up.
How is Mathdoku different from Sudoku? Sudoku uses boxes and pure logic. Mathdoku has no boxes. It uses cages with arithmetic targets, so you need logic and simple sums together.
Do I need to be good at maths? No. You only add, subtract, multiply and divide small numbers.
Is Mathdoku the same as Calcudoku? Yes. They are two names for the same style of puzzle.
Do I need an account? No. Open the page and play.
Can I play on my phone? Yes. The game runs in your phone’s browser.