Puzzle / Game
Sumstone
The classic numbers puzzle - pick your tiles, reach the target, beat the clock.
Six numbers. One goal. Endless combinations. A calm, satisfying math puzzle inspired by the Countdown numbers round. No internet needed, no accounts, no pressure.
Coming soon to the App Store
Why Sumstone?
Timed Rounds
Race against the clock to find the solution. Multiple time limits for different difficulty levels.
Multiple Difficulties
From easy warm-ups to brain-bending challenges. Find your perfect level.
Offline Play
No internet required. Play anywhere, anytime - on the subway, in a waiting room, on a plane.
No Ads, No Accounts
Just the puzzle. No sign-ups, no interruptions, no tracking. Pure focus.
How to Play
Simple to learn, satisfying to master. Each round is a fresh puzzle.
Get your numbers
Six number tiles are dealt - a mix of small numbers (1–10) and large ones (25, 50, 75, 100). Every round is different.
See the target
A three-digit target number is revealed. Your goal: reach it (or get as close as possible) using your tiles.
Build your solution
Combine tiles using addition, subtraction, multiplication, and division. You don't have to use all six.
Beat the clock
The timer is ticking. Submit your best answer before time runs out. Closer solutions score more points.
The puzzle in your pocket
A clean, focused interface designed to keep you in the flow - no distractions, just numbers.
Six tiles. One target. Go.
Pick your challenge level.
See your score and best path.
Frequently Asked Questions
Is Sumstone free?
Yes, Sumstone is completely free to download and play. There are no in-app purchases or subscriptions.
Does Sumstone work offline?
Absolutely. Sumstone requires no internet connection. Once downloaded, you can play anywhere without Wi-Fi or data.
What is the Countdown numbers game?
The Countdown numbers game is a classic British TV puzzle where contestants use six numbers and basic arithmetic (+, -, ×, ÷) to reach a target number. Sumstone is inspired by this format.
Is Sumstone available on Android?
Currently Sumstone is available on iOS. Android support is planned for a future update.
Do I need to be good at math to play?
Not at all! Sumstone is about logical thinking and exploration. The easier levels are accessible to everyone, while harder levels challenge math enthusiasts.
Ready to play?
Free to download. No internet required. No ads.
Coming soon to the App Store