To celebrate the 25th anniversary of Sonic this hack improve the NES version of Sonic the hedgehog,making it more playable and enjoyable.
Here´s gameplay video by Madlittlepixel
You need the original ROM to patch “Somari (Unl) [p1].nes”
Recommended Emulator for NES
Update 2018 – This year, the Sonic the Hedgehog hack for the NES received updates on the title screen for 2018, some Green Hill Zone stages, Sonic’s belly, eventual bugs, and character color palettes.