Rating: 4.1/5
Contrary to the title of this game - This isn't Sonic the Hedgehog 4. It's actually a romhack/pirate of Speedy Gonzales for the Super Nintendo - Replacing Speedy with Sonic and the trapped people with Mario. It's not exactly a good hack/pirate, but not exactly the worst there is.
You also need an emulator to run this game. To grab one quickly, please check out our SNES emulators section.