Gamerpics:Complete the game to unlock the two Gamerpics (companion cube with wings and a knife cutting a cake).Incinerate the Companion Cube in Test Chamber 17 to unlock the Portal Gamerpic.Defeat GLaDOS and escape to unlock the Portal Gamerpic.Alternate opening screen:Complete the game to have the cake appear at the opening screen. Allow the game to idle at that screen to see other new changes.Portal Codes:Enter the following codes during game play to activate the corresponding cheats:CHEAT CODE – CHEAT FUNCTIONDown, B, A, B, Y, Down, B, A, B, Y – Create BoxUp, Y, Y, X, X, A, A, B, B, Up – Fire Energy BallUp, Y, Y, B, B, A, A, X, X, Up – Fire Rocket ProjectileY, A, B, A, B, Y, Y, A, Left, Right – Portal Placement AnywhereUp, Left, Down, Right, Up, Left, Down, Right, Y, Y – Portalgun ID 0Up, Left, Down, Right, Up, Left, Down, Right, X, X – Portalgun ID 1Up, Left, Down, Right, Up, Left, Down, Right, A,A – Portalgun ID 2Up, Left, Down, Right, Up, Left, Down, Right, B, B – Portalgun ID 3X, B, LB, RB, Left, Right, LB, RB, LT, RT – Upgrade Portalgun Achievements:ACHIEVEMENT – HOW TO UNLOCKGo for the Gold (15 points) – Win a gold metal on a challenge map.Out of the Blue (25 points) – After gaining control of both portals, only enter the orange portal.Rat