[1][2] In The Wonderful End of the World, the player takes control of a puppet that is able to grab small objects.

The level ends once the player has consumed a predetermined number of objects.

Once the level ends, the player receives a grade ranging from A+ to F. There is also an exploration mode, where there is no objective.

[1] The Wonderful End of the World was updated shortly before the release of Portal 2 in 2011 as part of an alternate reality game.

A secret level containing Portal easter eggs and potatoes was added to the game.