Portal – Hall of Science Map. You certainly know the Portals games, developed by Valve, and the Portalgun mod, created by iChun. This is a map with the totality of the first Portal game and, eventually, some new test chambers.
Portal Map Screenshots:
18 Tests chambers from the game. 13 additional rooms. The “Second part” of the game. “Her”. All.
How to install:
Download link for Portal – Hall of Science Map: