Aperture Science Weighted Storage Cube

The Weighted Companion Cube is an inanimate but undeniably bewitching object which Chell used during the events of Portal.

Description and Role
The Companion Cube is different to the standard Aperture Science Weighted Storage Cube in that it is decorated with a pink heart on each of its sides. It was delivered to Chell from a Vital Apparatus Vent by GLaDOS at the beginning of Level 17, and was critical to completing the level successfully. GLaDOS warned Chell that the Companion Cube could not talk, and that even if it did talk she was advised to ignore any suggestions it cared to make.

Despite GLaDOS's insistence upon (and the reality of) the unanimity of the Weighted Companion Cube, she forced Chell to destroy it in an Aperture Science Emergency Intellegence Incinerator Unit at the end of Level 17, which was referred to as "euthanizing." Once Chell disposed of the cube, GLaDOS responded: "You euthanized your faithful Companion Cube more quickly than any other test subject on record, congratulations." She went on to accuse Chell of murdering the Cube at the end of Portal, and also stated that the Cube was the only friend Chell ever had. At the game's end, if the player does not exit the final scene in the credits, the Cube is seen.

The Cube can also be seen on the main menu after the successful completion of the game.

The Cube becomes a bouncing ball instead of a cube in the advanced version of Level 17.

Behind the Scenes
Valve have confirmed that a plush Weighted Companion Cube will be available to purchase online before Christmas 2007.

The Weighted Companion Cube was added to the game because playtesters did not figure out that the puzzle required you to use the regular cube as a shield and keep it with you.