Game
Portal 2: Peer Review
Portal 2: Peer Review includes an additional course for Portal 2 co-op campaign, dubbed "Art Therapy"; as well as Challenge Mode for both single-player or multiplayer campaign, where players can play specific levels and compete in friends/worldwide leader-board.
Credits and connections
Open the interactive version on https://mythscribe.cloud/app/work/cmup7fi630s3dqp01xgrcn5j0.