Dr. Robotnik's Ring Racers is a kart racing video game originally based on the 3D Sonic the Hedgehog fan-game "Sonic Robo Blast 2", which itself is based on a modified version of Doom Legacy. It is the sequel to Sonic Robo Blast 2 Kart. Hang up your sneakers, because Dr. Robotnik and his ex-enemies are going go-karting! Use the untapped potential of rings to super-charge your vehicle across more than 200 crazy courses. With over 20 unique items and some of the hottest moves on this side of the Floating Island, this is Racing at the Next Level!