You need to type these cheats in the console. Activate the console by pressing the tilde ~ key.
 

Code - Description
give all - Get all items
give health - Increases your health points by 100
give weapons - Get all weapons
give ammo - Get 100 shells, 200 bullets, 200 cells, 50 grenades, 50 rockets, and 50 slugs.
give armor - Get body armor
give body armor - Increase body armor by 1 point
god - God mode
notarget - Enemies won't attack you until you shoot them
noclip - Walk through walls
give jacket armor - Get jacket armor
give blaster - Get blaster
give shotgun - Get shotgun
give super shotgun - Get super shotgun
give machinegun - Get machinegun
give chaingun - Get chaingun
give grenade launcher - Get grenade launcher
give rocket launcher - Get rocket launcher
give railgun - Get railgun
give bfg10k - Get BFG 10000
give shells - Get 10 shells
give bullets - Get 50 bullets
give cells - Get 50 cells
give grenades - Get 5 grenades
give rockets - Get 5 rockets
give slugs - Get 10 slugs
give quad damage - Get quad damage
give invulnerability - Get invulnerability
give silencer - Get silencer
give rebreather - Get rebreather
give environment suit - Get environment suit
give ancient head - Get ancient head
give adrenaline - Get adrenaline
give bandolier - Get bandolier
give ammo pack - Get ammo pack
give data cd - Get data CD
give power cube - Get power cube
give pyramid key - Get pyramid key
give data spinner - Get data spinner
give airstrike marker - Get airstrike marker (not included in "give all")
give blue key - Get blue key (not included in "give all")
give red key - Get red key (not included in "give all")
give security pass - Get security pass (not included in "give all")
give commander's head - Get commander's head (not included in "give all")
give power shield - Get power shield (not included in "give all")
give armor shard - Get armor shard (not included in "give all")
give combat armor - Get combat armor (not included in "give all")
Quake 2
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