Sonic CD, on the other hand, is a far more playable game. Released originally for the Sega CD and the PC, Sonic CD takes its cues from the original side-scrolling Sonic the Hedgehog games, though Sonic CD's unique time-traveling mechanic definitely helps set it apart. Since it came on a compact disc--a rarity for video games at the time--one of the most standout aspects of Sonic CD when it was originally released was the fidelity of the soundtrack. Though some exceptionally obsessive Sonic fans may turn all red in the face because the game uses the US soundtrack rather than the original Japanese soundtrack, the hot guitar licks of "Sonic Boom," the game's opening theme, still sound as crisp and ridiculously over the top as they originally did in 1993. Nostalgia or no, Sonic CD is easily the best game in this package.