Sonic Mega Collection Plus DX

Sonic Mega Collection Plus DX is the successor of Sonic Mega Collection (Plus). On the Nintendo DS and 3DS, it is known as Sonic Classic Collection DX or Sonic Classic Collection DX 3D, along with fewer games.

Mega Drive/Genesis

 * Sonic the Hedgehog
 * Sonic the Hedgehog 2
 * Sonic the Hedgehog 3
 * Sonic & Knuckles
 * Knuckes the Echidna in Sonic the Hedgehog 2 (Knuckles in Sonic 2)
 * Sonic the Hedgehog 3 & Knuckles (Sonic 3 & Knuckles)
 * Blue Sphere
 * Sonic 3D Blast
 * Dr. Robotnik's Mean Bean Machine (Mean Bean Machine)
 * Flickies
 * Ristar (unlockable by having a save file of Sonic's Ultimate Genesis Collection or Sonic Generations. Alternatively for the Wii U: save files of Sonic Unleashed and Sonic Colors)
 * Ooze Zone (unlockable as the methods above, but alternatively for the Wii U: save file of Sonic Dimensions)

Master System/Game Gear

 * Sonic the Hedgehog
 * Sonic Chaos
 * Sonic Labyrinth
 * Sonic Blast
 * Dr. Robotnik's Mean Bean Machine (Dr. Robotnik's Machine)

Other
These following games (except for Sonic the Hedgehog Pocket Adventure) are unlocked by having the GameCube save file for Sonic Gems Collection. (That is if the Wii U DOES allow GameCube Memory Cards...)
 * Sonic CD
 * Sonic the Fighters
 * Sonic R
 * Sonic the Hedgehog Pocket Adventure (Sonic Pocket Adventure) (unlocked by having a save file of Sonic Generations)

Mega Drive/Genesis

 * Sonic the Hedgehog
 * Sonic the Hedgehog 2
 * Sonic the Hedgehog 3
 * Sonic & Knuckles
 * Dr. Robotnik's Mean Bean Machine (Mean Bean Machine)

Game Gear

 * Sonic the Hedgehog
 * Sonic Chaos
 * Dr. Robotnik's Mean Bean Machine (Dr. Robotnik's Machine)

Other

 * Sonic the Hedgehog Pocket Adventure (Pocket Adventure) (unlocked by switching to Sonic Rush in the Card Slot at the Card Scan option, then resert this game back into the Card Slot. Alternatively for the 3DS version: switch this game's Game Card with Sonic Generation's at the main menu (it will then tell you that hidden games are discovered!), then switch back to this game)
 * Sonic Battle ~Demo~ (unlocked by switching to Sonic Rush Adventure in the Card Slot at the Card Scan option, then resert this game back into the Card Slot. Alternatively for the 3DS version: switch this game's Game Card with Sonic Generation's at the main menu (it will then tell you that hidden games are discovered!), then switch back to this game)

Home Consoles

 * Games
 * Extras
 * Comics
 * Illustrations
 * Movies
 * Manual
 * Options

Systems

 * PlayStation 3
 * Xbox 360
 * Wii U
 * Nintendo DS
 * Nintendo 3DS