About this app
Simply trace the screen to create a Marble Runs! An easy-to-use app designed for everyone – it allows them to create fun devices similar to those featured on Marble Runs (Chain reaction machine). Use a dragging motion to draw a line and create a simple device that follows that path, and then try changing the device afterward! The longer the straight line, the more devices you can choose from. Have fun making your device move in many different ways! We plan to add many more devices in the future! *Method of operation: - Trace the screen with your finger to create a path. - Lift your finger to create a simple device. - Tap the device to swap it for another one. - Press the Start button to start. Have fun by changing the angle and the zoom on the camera. - Sound effects: turn them on/off from the options on the top right of the top screen. - Music: turn it on/off from the options on the top right of the top screen. - Device shadows: turn them on/off from the options on the top right of the top screen. *If your smartphone is showing low performance, we recommend turning the shadows off.
Latest release
What’s New
- We've introduced a login bonus where you can get a few contraptions every day! - You can now test the contraptions' actions in the Contraption Encyclopedia! - We've removed the feature in the Contraption Encyclopedia where you could get contraptions by watching ads! - We've added a feature in the game that allows you to replace all contraptions you've already created by watching an ad!
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 23, 2026 · 12:02 PM Free
Screenshots
