Sonic Mega Collection

Sonic Mega Collection is a compilation of games for the  with the addition of many extras.

Seven Sonic games: Three lock-on modes from Sonic & Knuckles: Unlockable Sega Genesis games:
 * Sonic the Hedgehog
 * Sonic the Hedgehog 2
 * Sonic the Hedgehog 3
 * Sonic & Knuckles
 * Sonic 3D Blast
 * Sonic the Hedgehog Spinball
 * Dr. Robotnik's Mean Bean Machine
 * Sonic 3 & Knuckles
 * Knuckles the Echidna in Sonic the Hedgehog 2
 * Blue Sphere
 * Flicky
 * Ristar
 * The Ooze - Japanese version only
 * Comix Zone - Japanese version only

Unlockable Games
Many games have to be played multiple times in order to unlock new games, but the games don't necessarily have to be played. Simply enter the game and once it has started, exit out and repeat.