"Fan-Made Portal 2 Mod Offers Free Prequel Story with 40 New Chambers"
Originally Published 2 years ago — by Eurogamer.net
A fan-made mod for Portal 2, called Portal: Revolution, introduces 40 new test chambers, fresh mechanics, and a new storyline set between the events of Portal and Portal 2. Developed by Second Face Software, the mod requires Portal 2 on Steam and offers around eight hours of gameplay, featuring a new laser cube variant and puzzles using only the blue Portal Gun.