Version 2 of SSO is here.* Changes include a new class - Hunter, new shopping system, party system, accessory upgrading, item bank, new landmasses, new dungeon, PVP Arena (no PVP though), level cap of 40, and much more!
Of course, after authorization. Or you could head on over to:
Gamejolt.com
SSO on GameMaker Server:
Gamemakerserver.com
HatCat Productions:
Hatcatproductions.webs.com