What is the fine-grained topic of the following text: Earlier today Activision announced a new Teenage Mutant Ninja Turtles movie tie-in game for the Nintendo 3DS developed by Magic Pockets, who also made the Nickelodeon TMNT game for Xbox 360, the Wii, and the 3DS. Only return the topic.
Announcement of a new Teenage Mutant Ninja Turtles game for Nintendo 3DS by Activision and Magic Pockets.