Press ~ during game play to display the console window, then activate the following cheats by entering the corresponding codes:
CHEAT FUNCTION - CHEAT CODE All weapons and items - give all Maximum ammunition - give ammo All keys - give keys 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 Get a kill - give kill Matrix-style pause - pause God mode - toggle g_p_god Suicide - kill Display map information - toggle g_map_info Display game statistics - toggle r_stats Debug mode - toggle g_debug Camera can explore level - camera camera Return camera to normal - camera player View frame rate - toggle r_timings
Complete the game on all difficulty settings to receive the "Thunder gun", which can kill anything in sight. When entering a loading screen or room, quickly tap [Fire]. The gun will fire in every direction. You will get a great health boost and all enemies will be killed.
Go to Episode 8 Part 3 and, at Mech-Nukem's left arm (the incomplete one), press UP near the path in front of it. You will enter a secret area containing Wozma the secret boss. During this time you will have infinite ammo.