Sonic CD is a platform video game developed by Sonic Team and published by Sega. It was initially released for the Sega Mega-CD in 1993. It has since been re-released on Microsoft Windows 9x in 1996.
The game's story focuses on Sonic the Hedgehog as he infiltrates a once peaceful mechanized planet. Doctor Eggman, Sonic's arch nemesis, uses the planet's time travelling properties to make it his own headquarters. He also has Sonic's robotic counterpart Metal Sonic capture Amy Rose. Sonic must travel through time to save Amy, foil Eggman's plans and bring peace back to the world. The game has been critically acclaimed since release.