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Cheats
Cheat: Achievements
Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement How to unlock
A Feeling Like Floating ( 5 points )Dissolve a turret.
Cupcake ( 10 points )Beat 5 advanced chambers.
Fruitcake ( 25 points )Beat 10 advanced chambers.
Go for the Gold ( 15 points )Win a gold metal on a challenge map.
Is Anyone There? ( 20 points )Complete the game without ever taking a bullet.
Like a Rat ( 20 points )Trap yourself in a test chamber so that GLaDOS has to help you continue.
Out of the Blue ( 25 points )Once you have control of both portals, only enter the orange portal.
Rat's Tale ( 15 points )Find all the Rat Man dens.
Saw That One Coming ( 5 points )Cause a rocket sentry to destroy its own rocket when the rocket has been redirected back towards it.
Tests Like Chicken ( 15 points )Find the chicken's test results.
The Camera Adds 10 Pounds ( 10 points )Knock a turret over with a security camera.
Vanilla Crazy Cake ( 35 points )Beat all advanced chambers.

Cheat: Alternate opening screen
Successfully 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.
Cheat: Gamerpics
Successfully complete the game to unlock the two Gamerpics (companion cube with wings and a knife cutting a cake).
 
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