Press ~ to bring up the cheat console. Type "giftfrompterodon" to activate the cheat mode. Then type one of the phrases below to activate that cheat.

• Enemies don't do damage: chtkostej
• Enemies wear masks: chtcannibals
• Get grenades: chtgrenades
• Quickfights: chtallqf
• Refill ammo: chtammo
• Restore health: chtheal
• Restore health (team): chthealteam
• Weapon select: chtweap (0-30)
• Out of body experience: cht3pv (0/1)
• Display framerate: showfps (0/1)
• Display system stats: showprof (0/1)