The fourth installment in the Infinity Series, “12Riven: The Psi Climinal of Integral,” is the first game in the series that KID Corp did not develop. As a result of the fact that they went out of business a few years previously when CyberFront bought them. This PSP port, released a year after the PlayStation 2 version with the same title in 2008, includes freshly recorded voice acting, updated CG event scenes, and a reworked soundtrack. The PlayStation 2 version was initially released. As a result of comments made by players regarding the standard of the previously released content for the PS2, several of the older CG events were redrawn.