What starts as a friendly competition between Sonic and Knuckles quickly gets intense as other rivals jump into the action! Utilize boost moves and power-ups as Sonic’s rivals try to trip, shove, and vault over Sonic while hurtling towards the finish line at breakneck speed! Negotiate wildly twisting 3D tracks, avoid hazardous traps and hazards, and watch out for the insidious Dr. Eggman and his myriad of contraptions! Whether playing alone or against a friend, it’s always a two-player experience based on tightly designed gameplay mechanics to support high-spirited competition and ultra-tight races!* Unique “Head-to-head” experience! * Single Player Mode: Competing one-on-one with each of your rivals will feel just as competitive as if playing against an actual player! * Multiplayer Mode: Go head-to-head with your buddy and trip, shove, even vault over each other as you hurtle towards the finish line at breakneck speed! * Sonic style 2D gameplay in true 3D environments, custom-built for the PSP! * Race in Sonic’s traditional 2D gameplay, but throughout obstacle-filled 3D tracks, enhancing the thrills of the race! * Built from the ground-up to maximize the technical potential of the PSP. * 4 characters, 4 different storylines: select Sonic or one of his rivals and play through each of their story through fast and winding stages! * Extensive rewards system based on trading card-collecting to enhance your character’s various skills as well as character customization. * WiFi connectivity allowing you to wager trading cards for various multiplayer challenges!