"Sonic CD" is a platform video game developed by Sega for the Sega CD console, released in 1993. It features Sonic the Hedgehog as the main character, who must rescue Amy Rose from the evil Dr. Robotnik. The game introduces time travel mechanics, allowing players to explore different timelines and alter the game's levels. The gameplay includes collecting rings, defeating enemies, and navigating through various zones. Players can travel to the past, present, and future, impacting the environment and unlocking new paths. "Sonic CD" is known for its unique gameplay, vibrant graphics, and a memorable soundtrack.