Debug Toolbar
From Kerbal Space Program Wiki
In KSP, there are several cheats, useful for helping debugging, simplifying things for newbies, goofing off, or just plain cheating.
Press Modifier (Alt) + F12 to open the cheat window with the following options.
- Hack gravity: no gravity
- Infinite fuel
- Infinite RCS Propellent
- Infinite EVA Pack fuel
- Whack a Kerbal: throw objects to destroy stuff
- Allow part clipping in editors