Sumstone - Math Puzzle Game
Think fast, crunch numbers
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Try the new Blitz mode! Solve the puzzle in just 30 seconds!
New daily puzzle every day. Monday starts easy, Sunday goes expert. Can you keep your streak alive?
Six numbers. One target. Can you crack it?
Sumstone is a number puzzle inspired by the Countdown game show. Combine six numbers using addition, subtraction,multiplication, and division to reach the target, or get as close as you can before time runs out.
DAILY PUZZLE
A new challenge every day, the same for every player. Difficulty rises through the week, from Easy on Monday to Expert on Sunday. Share your score, compare with friends, and build your streak.
PRACTICE MODE
Play unlimited puzzles at your own pace across four difficulty levels: Easy, Medium, Hard, and Expert.
SCORED ON THREE DIMENSIONS
Every round is scored out of 100 based on proximity (how close you got), elegance (fewest operations), and speed (time to solve). Chase the perfect 100.
DESIGNED TO FEEL GOOD
Satisfying animations, haptic feedback, and a clean minimal interface that stays out of the way. No clutter.
PLAY OFFLINE
No internet needed. Your puzzles, your stats, your progress are all stored on your device.
Track your stats, review your score history, and watch yourself improve over time.
EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://enewman00.github.io/countdown-game-website/#privacy
Terms and Conditions: https://enewman00.github.io/countdown-game-website/#terms
BLITZ MODE
Race the clock with the all-new Blitz Mode! Toggle it on for a 30-second countdown timer that adds a thrilling speed challenge to any puzzle. Solve it before time runs out to earn a guaranteed full speed bonus. No penalty for cutting it close. Available for both free play and daily puzzles, with your Blitz results tracked and included in your daily share. Think fast!
Minor Enhancements
- Text changes to increase readability
The developer, Ethan Newman, 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 Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Ethan Newman
- Size
- 59.3 MB
- Category
- Puzzle
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPod touch
Requires iOS 15.0 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+
- Contains
Advertising
- In-App Purchases
Yes
- Sumstone Pro - Yearly $17.99
- Sumstone Pro - Monthly $1.99
- Copyright
- © 2026 Ethan Newman