Sonic the Hedgehog 2 (2013)

Sonic the Hedgehog 2 (2013) is a full remaster of the original Sonic 2.

Development
After the success of Christian Whitehead's Sonic CD port in 2011, they immediately started production on reworking Sonic 2 for smartphones. This would mark the first time that Sonic would ever meet the Android phone.

Differences from the original

 * Hidden Palace Zone was included as a scrapped zone that was brought back from being lost in development of Sonic 2. It has an original boss, too. However, Its music remained unused and instead it plays Mystic Cave Zone two player.Brass eggman.jpg, the new boss.]]
 * Knuckles was included in the game without a need for DLC, unlike the original (You had to own Sonic & Knuckles).
 * There's an entirely new Starting Menu and base.
 * You can now save your progress and emeralds. (infinite continues were provided as a result)
 * You can access a secret sub-menu within the debug menu that allows you to use Sonic 3 elemental shields.
 * Tails can now fly and airlift Sonic
 * Special stages are now in 3D rendered environments
 * The game is now at a full 60fps
 * There's a fully remastered soundtrack