It's a big step for ngmoco but as well a big step for the iPhone as an gaming device. Plus+ Network, has been launched today. A free service for iPhone games and part social network, part gamer network - think Facebook meets XBox Live.

Welcome to the next step in iPhone gaming. Plus+ connects you to a vast community of iPhone gamers across a growing array of iPhone and iPod touch games. have a completionist streak? play to unlock every game award. want to take on the world? vie for a spot on our global leaderboards. feel like starting something? send direct challenges to your friends and step up the competition.

Game awards, leaderboards, friends list, and direct challenges via push notification service are for now only compatible with Stardefense. But Rolando & Co will follow pretty soon.

Here are some Screenshots: