1. Hit the Tab key to access the console that allows you to input these codes.
2. Type SUMMON [weapon] to get any weapon if you're a little light on firepower. Among Unreal's better weapons are the MINIGUN, STINGER, QUADSHOT, and CANNON.
3. Type ALLAMMO to get 999 rounds for all your weapons.
4. Type FLY to take to the air and GHOST to walk through walls if running and jumping just doesn't cut it.
5. Type INVISIBLE to make yourself invisible if you're still getting rocked by the bad guys.
6. Type WALK to resume normal movement when you get tired of zipping around like Casper.
7. Type KILLPAWNS to kill all the monsters when it's getting close to bedtime.
8. If you're really out of your league, type GOD to enable Godmode and make yourself invincible.
