It is required: original game with the last updates
Size: 30 Mb
This set of maps already became classical for Portal. The magnificent firm design, original puzzles and excellent sense of proportion do these maps mandatory for passing to each fan of game. Separately it is worth marking "door" puzzles — it when one breaker is responsible for opening of two doors. Either one, or another. Simply? At all. And if such buttons two? And if they are isolated from each other? And if?. However, possible "if" it is better to see and test all independently.
Copy files in the Steam folder \\SteamApps \\user name \\portal \\portal.