Kody na rzeczy:

GORDON IGNORE EXPLOSIVES - Lock & load - wszystkie bronie
DREAMCAST LOVES HEADCRABS - Get well soon - ...nie wiem

Kody do poszczególnych etapów:

BARNEY GOES TO WORK - Inseciurity
GORDON TEACHES PHYSICS - Unforesees consequences
GORDON ABHORS GRAVITY - Low Gravity
GORDON GOES TO WORK - Anomalous Materials
BIG IS BEUTIFUL - Power up
FILES AND FEAR - Office complex
COMBAT AND DEATH - Surface tension
POWER IN PROGRESS - power struggle
SAFE AND SOUND - Blast pit