Sonic The Hedgehog 2 Classic

Sonic The Hedgehog 2 Classic is a smartphone adaptation of the classic SEGA game that came out in 1992 on Genesis. This version was released by SEGA Forever, which is an official initiative that rereleases classic SEGA titles for free on Android.

This version is special because it includes many modifications to the original game. Among those are: the ability play in 16:9 without distorting the image; and the addition of both Knuckles and Tails as playable characters. These characters were not in the original cartridge, although they were included in Sonic & Knuckles.

Other than that, the levels and graphics are exactly the same as the original. Travel back to the eleven worlds of Sonic 2 to collect the Chaos Emeralds and defeat the evil Dr. Eggman (although he'll always be Robotnik in our hearts).

It's free to download, but does include a few banners in the menus and between levels. It's not too distracting, but you can also get rid of the ads with an in-game purchase. This is a great opportunity to play one of the most iconic games in video game history from the comfort of your smartphone.