Quake

Rocket Jump:
During Death match or Single Player .And It will hurt you to do this All you need to do is aim the Rocket Launcher Downwards and Jump 2-3 seconds at the same time and then you'll get a huge Jump to a higher.

Debug Mode:
Go to the password screen and put in "QQQQ QQQQ QQQQ QQQQ". The game will say it's incorrect, but if you go to the OPTIONS menu you'll find a new DEBUG entry. In it you'll find God Mode, Level Select, All Weapons and more.