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Stick LABORATORIES - Public
2 Members   |   0 In-Game   |   0 Online   |   1 In Group Chat
ThinkingWithPortals Mapping - Public
30,801 Members   |   211 In-Game   |   2,665 Online   |   291 In Group Chat
Half-Life Beta project - Public
2,120 Members   |   66 In-Game   |   389 Online   |   257 In Group Chat
Portal 2 Perpetual Testing Initiative Authors and Playtesters - Public
36 Members   |   2 In-Game   |   4 Online   |   5 In Group Chat