A special extended version of the popular GameCube compilation ported for the PS2 and Xbox, Sonic Mega Collection Plus contains 20 of the most popular Sonic the Hedgehog and SEGA Genesis titles in one convenient set. It carries over all the content of the previous version, including the following emulated Genesis games:
It also has the special games created by locking Sonic & Knuckles onto the earlier Sonic games: Blue Sphere, Knuckles the Echidna in Sonic the Hedgehog 2 and Sonic 3 & Knuckles.
New to the Plus version is a save-state function, lots of new artwork, movies and comics in addition to what was on GameCube and several new games. The Genesis games The Ooze and Comix Zone were now available in all regions. The previous version had included them only in Japan. Additionally, a Game Gear emulator was added along with six Game Gear games: