Enter the following codes during game play to activate the corresponding cheats:
CHEAT CODE - CHEAT FUNCTION DOWN, B, A, B, Y, DOWN, B, A, B, Y - Create Box UP, Y, Y, X, X, A, A, B, B, UP - Fire Energy Ball UP, Y, Y, B, B, A, A, X, X, UP - Fire Rocket Projectile Y, A, B, A, B, Y, Y, A, LEFT, RIGHT - Portal Placement Anywhere UP, LEFT, DOWN, RIGHT, UP, LEFT, DOWN, RIGHT, Y, Y - Portalgun ID 0 UP, LEFT, DOWN, RIGHT, UP, LEFT, DOWN, RIGHT, X, X - Portalgun ID 1 UP, LEFT, DOWN, RIGHT, UP, LEFT, DOWN, RIGHT, A,A - Portalgun ID 2 UP, LEFT, DOWN, RIGHT, UP, LEFT, DOWN, RIGHT, B, B - Portalgun ID 3 X, B, LB, RB, LEFT, RIGHT, LB, RB, LT, RT - UPgrade Portalgun
ACHIEVEMENT - HOW TO UNLOCK Go 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's Tale (15 points) - Find all the Rat Man dens. Is Anyone There? (20 points) - Complete the game without ever taking a bullet. Saw That One Coming (5 points) - Cause a rocket sentry to destroy its own rocket when the rocket has been redirected back towards it. The Camera Adds 10 Pounds (10 points) - Knock a turret over with a security camera. Like a Rat (20 points) - Trap yourself in a test chamber so that GLaDOS has to help you continue. A Feeling Like Floating (5 points) - Dissolve a turret. Tests Like Chicken (15 points) - Find the chicken's test results. Cupcake (10 points) - Beat 5 advanced chambers. Fruitcake (25 points) - Beat 10 advanced chambers. Vanilla Crazy Cake (35 points) - Beat all advanced chambers.
Although Portal developers claim that GLaDOS was originally designed to resemble the famous female figure of Botticelli's "Rise of Venus," this design was ditched. From some angles GLaDOS appears to be a bound and gagged female figure.