|Beat two Portal advanced maps.|
After beating the game, you have the choice to replay 6 different chapters on advanced. Specific chapter guides will be included soon...
|Rate this achievement||Average Rating|
|You need to register before being able to post comments.|
|You need to log in or register to use MyAchievements.|
|You need to log in or register to rate games.|
User Score is based on 2391 user ratings.