Birth By Sleep only for the PSP.
Birth By Sleep is the prequel of the first Kingdom Hearts game as its takes place 10 years before the original Kingdom Hearts. The game introduces player too three new Keyblade Wielders Terra, Aqua, and Ven. Ven shares a striking resemblance to Roxas Sora Nobody in Kingdom Heart 2. This game will probably answer some of the questions not answered in KH1 or KH2.