Sonic Mega Collection Plus is a video game compilation of twenty Sega titles, sixteen of which are from the Sonic the Hedgehog series. It was developed by Sonic Team and released for the PlayStation 2 and Xbox in 2004, and later the Windows PC in 2006, by Sega.

List of games:
Sonic the Hedgehog (16-bit)
Sonic the Hedgehog 2
Sonic the Hedgehog 3
Sonic & Knuckles
Sonic 3D Blast
Sonic Spinball
Dr. Robotnik's Mean Bean Machine
Sonic the Hedgehog
Sonic Labyrinth
Sonic Drift
Sonic Chaos
Sonic Blast
Dr. Robotnik's Mean Bean Machine

Unlockable games:

Blue Sphere
Knuckles in Sonic 2
Sonic 3 & Knuckles
Flicky
Ristar
The Ooze
Comix Zone

In addition to the default games, Sonic Mega Collection Plus features the following additional games that can be unlocked when their respective requirements are fulfilled. Afterwards, the player needs to exit back into the main menu then select "Games" again.

Sonic 3 & Knuckles: Play Sonic the Hedgehog 3 and Sonic & Knuckles twenty times each.
Knuckles in Sonic 2: Play Sonic the Hedgehog 2 and Sonic Spinball twenty times each.
Blue Sphere: Play Sonic the Hedgehog (16-bit) and Sonic 3D Blast twenty times each.
Flicky: Play Dr. Robotnik's Mean Bean Machine thirty times.
Ristar: Play Knuckles in Sonic 2, Sonic the Hedgehog 3 & Knuckles, Blue Sphere and Flicky thirty times each.
Comix Zone: Play the Sega Genesis games fifty times each or have a save file of Sonic Heroes on the same storage drive.
The Ooze: Unlock Knuckles in Sonic 2, Sonic 3 & Knuckles, Blue Sphere, Ristar and Flicky, or have a save file of Sonic Heroes on the same storage drive.