Во время игры нажмите кнопку [~] для вызова консоли и вводите:
give all        - все предметы
give health     - 100% здоровья
give weapons    - все пушки
give ammo       - все патроны
give armor      - 200% Брони
give body armor - +1 бронежилет
god             - неуязвимость
notarget        - непобедимость
noclip          - режим полета и хождения сквозь стены

Получение соответствующих предметов:
give jacket armor
give blaster
give shotgun
give super shotgun
give machinegun
give chaingun
give grenade launcher
give rocket launcher
give railgun
give bfg10k
give shells
give bullets
give cells
give grenades
give rockets
give slugs
give quad damage
give invulnerability
give silencer
give rebreather
give environment suit
give ancient head
give adrenaline
give bandolier
give ammo pack
give data cd
give power cube
give pyramid key
give data spinner

Что-то супер:
give airstrike marker
give blue key
give red key
give security pass
give commander's head
give power shield
give armor shard
give combat armor