Sonic CD is a side-scrolling platform game similar to the original Sonic the Hedgehog. ( Clockwise from top left) The past, present, good future, and bad future variants of the Palmtree Panic level A remake, developed by Christian Whitehead using the Retro Engine, was released for various platforms in 2011 and rereleased as part of the Sonic Origins compilation in 2022.

Sonic CD was ported to Windows as part of the Sega PC label in 1996, and to the PlayStation 2 and GameCube as part of Sonic Gems Collection in 2005. It sold over 1.5 million copies, making it the bestselling Sega CD game. Reviewers praised its size, music, and time travel feature, although some felt it did not fully use the Sega CD's capabilities. It received critical acclaim and is often called one of the best Sonic and platform games. Two soundtracks were composed: the one featured in the Japanese and European versions was composed by Naofumi Hataya and Masafumi Ogata, while the one in the North American version was composed by Spencer Nilsen, David Young, and Mark Crew. Sonic CD features the debuts of the recurring Sonic characters Amy Rose and Metal Sonic, and includes animated cutscenes. Led by Sonic 's co-creator Naoto Ohshima, the developers sought to show off the technical capabilities of the Sega CD.

Sonic CD began as a port of the Sega Genesis game Sonic the Hedgehog (1991), but developed into a separate project. By traveling through time, players can access different versions of stages, featuring alternative layouts, music, and graphics. Sonic CD introduces time travel as a game mechanic. Like other Sonic games, Sonic runs through themed levels while collecting rings and defeating robots. As Sonic the Hedgehog, the player attempts to protect an extraterrestrial body, Little Planet, from Doctor Robotnik. Sonic the Hedgehog CD is a 1993 platform game developed by Sega for the Sega CD.

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