There is a part near the beginning of the level with a 360 degree rotating gun turret and a forklift. Get in the forklift and find an enemy. When they appear and start to fire at you, do not shoot the forklift gun. Instead, run the forklift directly at them. If done fast enough, you will run over them and crush them to death.
Press T, then activate the following cheats by entering the corresponding codes:
CHEAT FUNCTION - CHEAT CODE Toggle God mode, press J to fly - swchan All items - swgimme Enable all cheats - swgreed Level select - swtrek Display framerate - swloc Change resolution - swres Restart level - swstart Toggle clipping - swghost Toggle auto-mapping - swmap Bunny rockets - swtrix Win Pachinko game for an item - winpachinko Load another .CFG file - config Quits game - swquit Change multiplayer player name - swname Creates "dbg.foo" debugging file - dumpsounds Plays a sound - sound Saves map - swsave Play CD music - cdon Stop CD music - cdoff Play CD track once - cd play Play CD track continuously - cd loop Clear saved game files - clear Display help menu - help