Runoff: Flow Puzzle
Pour water, wet every target
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Pour a cell and watch water find its own way downhill, split on ties, and pool in the basins. Wet every green target, dodge every red hazard, inside par + 1 pours.
A pocket-sized watershed.
Pour a cell and water finds its own way — downhill, splitting where two paths tie, spreading flat across a basin floor until it spills over the low side. Wet every green target, never touch a red hazard, and the level is solved — in exactly par pours if you read the terrain right, one more if you needed to feel your way there.
Every pour is a pure function of the terrain underneath it: the same tap always sends water the same way, there's no timer and no luck. Par isn't a guess either — it's the exact minimum a brute-force search found for that board, so a level with par 3 is provably not solvable in 2.
WHAT IT DOES
• 48 levels across four chapters — Trickle, Runnel, Basin, and a fourth that leans on everything the first three taught you.
• Real terrain, not a colour code: dark is low, pale is high, and a numeral in every cell gives you the height even in grayscale.
• Undo and Reset are free and unlimited. The only thing that costs you is a wasted pour.
• A high-contrast palette, an option to hide the height numerals, and a choice between watching the water run stage by stage or resolving it instantly.
• Dark mode, Dynamic Type and full VoiceOver — every cell is a button that reads its row, column, height and wetness aloud, and a finished pour announces what it did.
WHO IT'S FOR
Anyone who wants a puzzle with real mechanics under it — not tile-matching with a water skin, but an actual small hydrology model, quick enough for a coffee break and exact enough that the par badge means something.
PRIVACY
Runoff runs entirely on your device. There's no account, no network connection, and no analytics — every level you've solved lives in this device's storage and nowhere else.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
The developer, Jarle Hansen, 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
- Provider
- Jarle Hansen
- Size
- 994.3 KB
- Category
- Puzzle
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © Jarle Hansen