To celebrate the reboot of the TNT on the small screen, and to promote the show on the currently ongoing San Diego Comic Con, Nickelodeon launched a mobile app titled Turtles vs Foot.
The App allows Comic Con attendees to join either the Turtles Clan or the evil Foot Clan, and then get a free hat. The application is available on both android and Iphone here: http://m.turtlesvsfoot.com/index-desktop.html