Simplify the following text for a Grade 11 native English-speaking person.
Original: LittleBigPlanet , commonly abbreviated LBP , is a puzzle platformer video game , based on user-generated content , for the PlayStation 3 first announced on 7 March 2007 , by Phil Harrison at the Game Developers Conference ( GDC ) in San Francisco , California .
Simplified: It is only made for the PlayStation 3 , and it was first made known on 7 March 2007 , by Phil Harrison at the 2007 Game Developers Conference ( GDC ) in San Francisco , California .