3D Browser World Building and Adventure Game

http://www.awesomemmos.com/ Atmosphir is a 3D design tool and adventure game that allows players to create their very own games as well as their very own gaming levels, and then play them on any platform (PC or Mac) along with share them by uploading to the Atmosphir website. Game designers possess nearly unlimited flexibility to generate worlds out of anything they envision. Games can be combat or puzzle based (or both), multi-user or not, and visitors can jump in and try out whatever new levels/games are created, immediately.