传送门：进化/Portal: Revolution

Portal Revolution is a fan-made mod for Portal2 which plays before the events of Portal2 in the dead and decaying Aperture facility
Over40 new puzzles
The campaign contains40 brand new puzzles making use of new test elements and presents existing mechanics in a new way not seen in Portal2
Resurrected quot Pneumatic Diversity Vent quot element
New laser cube variant
Over15 puzzles using only the blue Portal-Gun
Gel Cleansing Field
Difficulty
Portal Revolutions puzzle difficulty starts where Portal2 stops but fear not All new mechanics and advanced portal tricks are taught to you We have ensured through rigorous playtesting that every player can solve the puzzles Although very few chambers require portals to be fired mid-air no puzzles require advanced tricky movement
Depending on your experience with Portal2 mechanics you can expect about5 to8 hours of playtime
Set inbetween Portal and Portal2 Portal Revolution tells a brand new story using new characters You play as a test subject who is awoken by a personality sphere called Stirling and join his mission to find a powerful device capable of restoring Aperture to its former glory.ENGINEPortal Revolution uses a modified version of Portal2 Community Edition s engine which is a custom version of the Counter-Strike Global Offensive Source Engine branch using licensed source code provided by Valve Software
This allowed us to introduce many mechanics and improvements to the engine to create an experience which would be impossible in Portal2