Sonic The Hedgehog

Not the easiest thing to play using on-screen buttons, but the fact this exists at all is a marvel. It's also a glorious conversion, with Sega finally taking the time to do the best Sonic justice. It's been remastered into widescreen and supports a wide range of Bluetooth controllers so, even if you don't yet own one, you'll be able to enjoy it fully when you eventually do.

credit: techradar.com

https://play.google.com/store/apps/details?id=com.sega.sonic1