Free Health:
During Half-Life 2 episodes, hit Up, Up, Down, Down, Left, Right, Left, Right, B, A.
Full Ammo :
During a Half-Life 2 or Episode 1 or 2 stage, hit this to max your ammo: Y, B, A, X, Right Bumper, Y, X, A, B, Right Bumper.
Unlock All Stages:
During the game hit left, left, left, left, left bumper, right, right, right, right, right bumper.
PORTAL CHEATS:
Hit these buttons during gameplay for the indicated cheat:
Create Box
Down, B, A, B, Y, Down, B, A, B, Y
Fire Energy Ball
Up, Y, Y, X, X, A, A, B, B, Up
Fire Rocket Projectile
Up, Y, Y, B, B, A, A, X, X, Up
Portalgun ID 0
Up, Left, Down, Right, Up, Left, Down, Right, Y, Y
Portalgun ID 1
Up, Left, Down, Right, Up, Left, Down, Right, X, X
Portalgun ID 2
Up, Left, Down, Right, Up, Left, Down, Right, A, A
Portalgun ID 3
Up, Left, Down, Right, Up, Left, Down, Right, B, B
Portal Placement Anywhere
Y, A, B, A, B, Y, Y, A, Left, Right
Upgrade Portalgun
X, B, Left Bumper, Right Bumper, Left, Right, Left Bumper, Right Bumper, Left Trigger, Right Trigger
Haranded's Weblog 