Press ~ to display the consolde window and enter one of the following codes:
God mode: toggle g_p_god
All weapons and items: give all
All weapons: give ammo
Jet pack: give jetpack
Force field: give forcefield
Extra life: give life
10 nukes: give nuke
100 ego: give health
Mark secret found: give secret
Spawn extra babe: give bomb
Matrix-style pause: pause
Debug mode: toggle g_debug
Display map information: toggle g_map_info
Display game statistics: toggle r_stats
Commit suicide: kill