Need help with Fuel Lab? We're here for you.
How do I unlock all levels?
After completing the first 10 free levels, tap the Unlock button in the paywall or in Settings to purchase Full Unlock for $2.99. This is a one-time payment that unlocks all 50 levels permanently.
I purchased Full Unlock but my levels are locked. What do I do?
Open Settings inside the app and tap "Restore Purchase". Apple will verify your purchase via your Apple ID and unlock all levels automatically.
I changed devices. Will I keep my purchase?
Yes! As long as you sign in with the same Apple ID, just tap "Restore Purchase" in Settings on the new device. Game progress (level, stars) is local to each device.
How do reactions work?
In the lab, certain colors mix to create new ones: blue + yellow = green, red + yellow = orange, red + blue = purple, and more. The MIX panel shows you which reactions are available in each level.
I'm stuck on a level. Help!
Try the RESET button to start the level over. Pay attention to the Target Colors at the top — they tell you what fuel types you need. Watch the MIX panel for available reactions. For cable puzzles, tap any cable piece to rotate it 90°.
Will there be more levels?
We're working on new content! Updates will be released through the App Store. Stay tuned.