Questions? Write to hola@cleanware.app. We answer in English or Spanish.
Frequently asked questions
Is there a subscription? No. World 1 (10 levels) is free with every part. One purchase (US$4.99) unlocks all five worlds forever on iPhone and iPad. Family Sharing works. No coins, no timers, no ads.
I'm stuck on a level. Tap the light bulb. The first hint is a nudge, the second the idea, and the third shows part of a machine. After a few tries you can also see a full solution. There is always more than one way to finish.
What do the stars mean? Any finish earns a star. Finish with the parts goal or fewer for 3 stars. Time is shown but doesn't count.
My wheel doesn't move. A wheel that isn't joined to anything is faded and sits out the run. Join it with a rod. Orange wheels drive right, blue wheels drive left, free wheels have no motor.
How do I share a machine? After you finish, tap Share: show the QR code, copy the code, or send a file. A friend opens it from Enter a code on the levels map, or by opening the file. It works in any world, bought or not.
My purchase doesn't show on my iPad. Open Settings, tap Restore purchase, and use the same Apple Account.
Why does it ask me a multiplication? That's the grown-up check. It comes before any purchase or link out of the game, so younger players don't buy or leave by accident.
Will my progress move to a new device? Your progress is in your normal iPhone or iPad backup. Restore that backup on the new device. There's no account and no cloud of our own.