Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.
This article contains spoilers. Read at your own risk!
It might spoil your gaming experience when first playing the related games.
Peer Review is a free DLC made for Portal 2 aimed at expanding upon the co-op aspect of the game.
Adding a challenge mode for both single-player and co-op maps, it allows a player to race certain maps trying to place the least amount of portals in the shortest amount of time as well as compare their scores with other users.