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https://www.lukassteinmetz.com/misc/2016/01/portal-testchamber-sign/
https://developer.valvesoftware.com/wiki/Custom_Testchamber_Signs
https://developer.valvesoftware.com/wiki/Sign_Maker
https://theportalwiki.com/wiki/Test_Chambers
https://theportalwiki.com/wiki/Portal_Test_Chamber_00
https://theportalwiki.com/wiki/Portal_Test_Chamber_08
https://www.reddit.com/r/gaming/comments/47ycw6/homemade_portal_test_c...
https://www.youtube.com/watch%3Fv%3DXXisv9z-fqY
https://steamcommunity.com/sharedfiles/filedetails/%3Fid%3D1287439983
https://forum.level1techs.com/t/diy-portal-test-chamber-sign/63549
https://garrysmods.org/download/14064/portal-1-test-chamber-signs
https://forums.thinking.withportals.com/general-discussion/portal-test...
https://www.deviantart.com/noxeen/art/Portal-Test-Chamber-Sign-2655857...
https://www.flickr.com/photos/saintkitten/6350088238
https://www.405th.com/forums/threads/portal-test-chamber-sign.33018/
https://www.pinterest.com/pin/415175659380087241/
https://www.moddb.com/games/portal/addons/electrons-custom-testchamber...
Co-Authored By:
2020-10-25