Accident Prone

Difficulty: Moderate
Number of Puzzles: 3
Theme: In Portal we are told that the 16th chamber is undergoing maintenance, and so Chell is sent to android training instead. Find out what happened to Chamber 16 to put it out of commission.

Shmitzchamber 1

Difficulty: Very Hard
Number of Puzzles: 5
Theme: Explore puzzles and portal methods never touched upon in the original game. This map was designed for players who want a much greater challenge after completing Portal.