Retro Knight isn't trying to be innovative. It wants to be the game you rented from Blockbuster, stayed up all night to beat, and returned with sore thumbs. On the PSP, it succeeds gloriously.
The standard is or PRO-C2 with CIPL flasher (for permanent patch on 1000/2000 models). For later models (3000/Go), Infinity 2.0 is the standard. retro knight psp