Chalk & Sum
A calm math puzzle for iPhone, drawn in chalk. Swap the magnet tiles, add + − × ÷, and make the sum.
Free · iPhone · iOS 26 or later · Coming 23 October 2026
Screenshots
How to play
- A target number is written in chalk at the top of the board.
- Drag the magnet tiles to swap them into any order.
- Place + − × ÷ between them, and brackets on later levels.
- Submit when it adds up. Many levels have more than one way, so find them all.
What's inside
- 60 hand-made levels across 6 chapters, from a gentle start to real brain teasers.
- A daily puzzle with a gentle streak that forgives one missed day a week.
- Relax mode: endless puzzles at your own pace.
- Doodles to collect: every chapter draws a hand-drawn doodle on your board.
- Hints in three steps: which operators, then the order, then the full answer.
- Calm by design: no timers, no lives, no rush.
- Game Center achievements and iCloud sync across your devices.
- iPhone Duo ready: the board and the tiles sit on facing pages.
Common questions
Is Chalk & Sum free?
Yes. It's free to download and play, with occasional ads between levels. A one-time Remove Ads purchase turns them off, and optional coin packs buy extra doodles.
How do I move my progress to a new phone?
Leave iCloud sync on in Settings and sign in with the same Apple ID on the new device.
I bought Remove Ads but still see ads.
Open the Store or Settings in the game and tap Restore purchases.
How do I get more hints?
You get 3 free hints every day, one more for finding every way on a level, and you can watch an optional ad for another.
Support
Found a bug or have an idea? Email kartik14704@gmail.com. It helps to mention your device, your iOS version and the level you were on.