Easy "Preservation Of Mass" achievement for Portal 2 - Xbox 360

• Easy "Preservation Of Mass" achievement

Play Chapter 2 "Test Chamber 7". Keep track of the Companion Cube in this chamber. You can return to get it at the end of the level after using it to depress the button. Ignore GLadOS's comments and carry the cube through the broken "Emancipation Grill" at the end of the chamber to earn the achievement.

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