Dr. Robotnik has returned to capture a magical island in the sky, which only appears once every century. Sonic must stop the crazed doctor's evil plot, while rescuing his favorite gal-hedgehog, Amy. With enormous levels in the past, present, and future, the "Blue Dude with a Tude" is able to spin-dash through loops, hills, and even time itself!
Sonic CD features the hop-and-bop gameplay you've come to expect, and adds 3D bonus rounds where Sonic races through otherworldly mazes, destroying UFOs to gain time points. Sonic CD also features a CD-quality, QSound-encoded soundtrack, featuring full vocals and sound effects.