Sonic Rivals 2 is a platform racing video game developed by Backbone Entertainment and released in 2007 for the PlayStation Portable (PSP). It is the sequel to Sonic Rivals. The game features 12 playable characters and builds upon the gameplay mechanics of its predecessor, with players racing against each other or AI competitors while navigating obstacle-filled stages. The game also includes battle modes and a single-player story mode that delves into the mysteries behind the Chao disappearance and the nefarious plans of Dr. Eggman Nega.