Form10
Puzzle
Free · Designed for iPad. Not verified for macOS.
Form10 is a small mental-arithmetic puzzle for iPhone — the famous "train game", rebuilt.
You see four digits. Combine them so the answer is exactly 10. Use plus, minus, times, divide. Use brackets if you need them. Use every digit, each one once.
That's the whole game.
THREE WAYS TO PLAY
Daily — One puzzle a day, 20 seconds to solve it. Solve it on consecutive days to build a streak.
Endless — Solve as many as you can in one run. The puzzles get harder and the timer tightens as you go. Save your spot at any level boundary; pick up later.
Practice — No timer. Pick a difficulty and play at your own pace. Stuck? Tap to reveal a solution.
SIMPLE BY DESIGN
No accounts. No sign-up. Free to download — no ads, no in-app purchases. Your scores stay on your phone. Apple's Privacy Nutrition Label says "Data Not Collected" because none is.
Made on a train. Mostly.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
- New feature: Achievements
- Haptics
- Quality of life improvements like a cursor and disabling invalid buttons on the keyboard
- See possible solutions when you lose
The developer, Ed Colyer, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Ed Colyer
- Size
- 30.5 MB
- Category
- Puzzle
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Ed Colyer