How do you play Twenty Four?

Pick two numbers, then an operation. The result replaces both numbers. Keep going until one number is left; it has to be 24. Tap two numbers, then an operation.

Is Twenty Four free to play?

Yes. Twenty Four runs in the browser for nothing: no download, no account and no sign-up. Twenty Four sits on the Numbers shelf at Mondo Knows, alongside numbers and maths games.

How long does a game of Twenty Four take?

2-6 minutes. It is rated medium, and tap two numbers, then an operation. Your best score stays on your own device.

Does Twenty Four work on a phone?

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

Mondo Knows Games

Twenty Four

A arithmetic puzzle with one rule: use all four numbers and the four operations to make 24. Pick two numbers, choose an operation, and keep merging until one number is left.

Best Number GamesMedium2-6 minutesPlays on mobile

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How to play

Pick two numbers, then an operation.
The result replaces both numbers.
Keep going until one number is left; it has to be 24.
Division has to come out as a whole number.

Controls

Tap two numbers, then an operation.

More numbers games from Mondo

Magic SquareArrange 1 to 9 so every line makes fifteen.CodebreakerCrack a four-digit code in ten guesses.Number PyramidEach brick is the sum of the two beneath it.Block MergeSlide the tiles and merge your way to 2048.

Questions people ask

How do you play Twenty Four?: Pick two numbers, then an operation. The result replaces both numbers. Keep going until one number is left; it has to be 24. Tap two numbers, then an operation.
Is Twenty Four free to play?: Yes. Twenty Four runs in the browser for nothing: no download, no account and no sign-up. Twenty Four sits on the Numbers shelf at Mondo Knows, alongside numbers and maths games.
How long does a game of Twenty Four take?: 2-6 minutes. It is rated medium, and tap two numbers, then an operation. Your best score stays on your own device.
Does Twenty Four work on a phone?: Yes. The board sizes itself to the screen, so Twenty Four 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.