Portal 2: Difference between revisions
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==== Peer Review ==== | ==== Peer Review ==== | ||
'''Peer Review''' is the first DLC released for ''Portal 2''. Released on October 4th, 2011; this DLC introduces | '''Peer Review''' is the first DLC released for ''Portal 2''. Released on October 4th, 2011; this DLC introduces Challenge modes for both single-player and [[Cooperative Testing Initiative|co-op]], a leaderboards system, and a mini-hub area reserved for additional co-op tracks. This DLC adds the first of many additional courses to come with the introduction of the Art Therapy testing course. | ||
==== Perpetual Testing Initiative ==== | ==== Perpetual Testing Initiative ==== | ||