Make 10 from four digits.
Plus, minus, times, divide.
Try a puzzle
↑ a real puzzle from the app. Have a go.
A small mental-arithmetic puzzle for iPhone. One quick puzzle when you've got a minute spare, or a longer run when you've got time to focus. Free to download, no ads, no in-app purchases.
Three ways to play
Three modes.
Today's puzzle
▲Daily
One puzzle a day, with a 20-second timer. The same four digits for everyone. Solve it on consecutive days to build a streak.
Score chase
★Endless
Solve as many as you can in one run. The timer tightens and the puzzles get harder as you go. Save your spot at any level.
No timer
◐Practice
Pick a difficulty and play at your own pace. Nothing tracked. If you get stuck, tap to reveal a solution.
The deal
Simple, by design.
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Free to download
No ads, no in-app purchases. Just the app.
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No sign-up
Open the app and play. Nothing to set up first.
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Stays on your phone
Your scores live on your device. Not synced anywhere.
Make 10.
Inspired by "the train game" — the four-digit carriage numbers on Sydney trains.