Ultima's once-famed Sonic 2 hack. Collect the emeralds through the levels (there's one in every act of every zone) and you will encounter a little secret at the end of the game. New graphics and level layouts are also features in this hack.
Sonic the Hedgehog 2 (W) [!].bin
CRC32: 7B905383
MD5: 9FEEB724052C39982D432A7851C98D3E
SHA-1: 8BCA5DCEF1AF3E00098666FD892DC1C2A76333F9