Find the hidden paint drops from the map they left behind.

Each colour has one hidden drop. Paint spreads one cell per step, and where two colours arrive together the cell stays striped. Read the map and tap where each drop fell.

Google Play — coming soonApp Store — coming soon

No ads
No accounts
Works offline
First 32 levels free

Collision Maps level 1: a 5×5 grid with a blue area, a red area and striped collision cells, with a red and a blue colour to pick below

A look inside

The Collision Maps tutorial: a 5×5 grid showing how red and blue paint spread step by step from two circled drops, with striped cells where they meet — **How paint spreads**A short tutorial shows it step by step.

A solved Collision Maps level: red and blue areas with both drops marked by circles and a Solved message — **Solved**Every drop found.

A tough Collision Maps level: a 7×7 grid with four colours and only a few numbers — **Tough levels**Fewer numbers, more thinking.

How it plays

Paint spreads: Hidden paint drops sit on the grid, one per colour. Paint spreads one cell per step: up, down, left and right. Each cell takes the colour of the drop that reaches it first.
Collisions: Where two colours arrive at the same step, the cell stays white and striped. A striped cell is exactly as far from two drops, so it tells you a lot.
Numbers: A number shows the step at which paint reached that cell. Use the numbers, the colour borders and the collisions to find where each drop fell.
Learn, then keep going: 20 tutorial levels teach the rules step by step. After that, levels never end: difficulty rises and falls, with a tough level every 21.
Daily puzzle: A free daily puzzle, plus hints, undo and restart, and light and dark mode.
Fair price: The first 32 levels are free. One purchase of 0.99 USD unlocks all levels for good, and 10 extra hints cost 0.99 USD. No ads and no tracking.

Privacy

Collision Maps has no accounts, no ads and no analytics, and the app itself sends nothing over the internet. Your progress stays on your phone. Read the full privacy policy.

Questions or feedback? Send a message.