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Icy Veins 
Arcade Cloud 
EV.IO 
Luminosity GDC 2013: Roblox Mobile Lets Construction Gamers Build, Play, and Discover New Gaming Worlds
Players can create, build, and invite their friends to play games within the Robolox system.
Roblox is an online sandbox game with the tools to let users create their own gaming worlds, complete with physics, weapons, and environments using consumer-level creation tools. There's a website, too, which uses a youtube-like portal interface to help players publish their games easily, and find other games and worlds to play in. The iOS version is taking off, said CEO David Baszucki, and becoming a core part of the company strategy for cross-platform gaming, as all versions of the game have the same code base.
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Rob LeFebvre
Dad. Mac head. Ukulele nerd. Gamer. Rob lives in Anchorage, Alaska, and commutes daily to the intarwebs to edit and write about iOS, Mac, books, and video games. He is currently employed as the editor at 148Apps, the best gosh-darn iPhone site this side of Mars, and contributes freelance to various other sites, including Cult of Mac and VentureBeat. Somehow he still finds time to play in a Disco band, raise two amazing kids, and hang on to his day job.