Sonic CD launched in 1993 for the Sega CD add-on, developed by Sonic Team as a time-travel platformer where Sonic raced through past and future versions of each stage. The game introduced Amy Rose and Metal Sonic and became one of the most re-released entries in the series, appearing on later compilations and digital stores. Its distinctive jump effect survived those ports and later circulated in soundboards and video edits, where retro game fans use it as shorthand for a classic Sonic leap.