How do you play Calcudoku?

Fill each row with 1 to N once, and each column the same. Each cage combines with its printed operation to reach its target. A cage never repeats a number. Click a square, then a number. Click Clear to empty a square, Check to test the grid.

Is Calcudoku free to play?

Yes. Calcudoku runs in the browser for nothing: no download, no account and no sign-up. Calcudoku sits on the Puzzle shelf at Mondo Knows, alongside calcudoku and kenken games.

Does Calcudoku work on a phone?

Yes. The board sizes itself to the screen, so Calcudoku plays the same on a phone as on a desktop, and touch controls replace the mouse. Nothing needs installing.

Mondo Knows Games

Calcudoku

KenKen by its original name: every row and column holds 1 to N exactly once, and the tilted numbers in each cage say what its arithmetic comes to. There are no starting digits, so the sums and products are the only way in. Puzzles are generated fresh with thick cage borders, so you can always ask for another.

Best Puzzle GamesHard5-15 minutesPlays on mobile

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How to play

Fill each row with 1 to N once, and each column the same.
Each cage combines with its printed operation to reach its target.
A cage never repeats a number.
Tap a square, then tap a number to place it.

Controls

Click a square, then a number. Click Clear to empty a square, Check to test the grid.

More puzzle games from Mondo

KakuroCrossword grids where the answers are sums.Mahjong SolitaireClear the 144-tile turtle by matching free pairs.Sliding PuzzleSlide the tiles back into order.Mondo MinesweeperClear every safe square without hitting a mine.

Questions people ask

How do you play Calcudoku?: Fill each row with 1 to N once, and each column the same. Each cage combines with its printed operation to reach its target. A cage never repeats a number. Click a square, then a number. Click Clear to empty a square, Check to test the grid.
Is Calcudoku free to play?: Yes. Calcudoku runs in the browser for nothing: no download, no account and no sign-up. Calcudoku sits on the Puzzle shelf at Mondo Knows, alongside calcudoku and kenken games.
How long does a game of Calcudoku take?: 5-15 minutes. It is rated hard, and click a square, then a number. Click Clear to empty a square, Check to test the grid. Your best score stays on your own device.
Does Calcudoku work on a phone?: Yes. The board sizes itself to the screen, so Calcudoku plays the same on a phone as on a desktop, and touch controls replace the mouse. Nothing needs installing.

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Everything runs in your browser. Scores and bests are stored on your own device, not on a server.