This game is just BAD BAD BAD! Not only is it bad, they made the graphics worse, and the music sounds like a Gameboy Cracking. I played Green Hill Zone, and the next thing you know... I shipped it back.
Sonic the hedgehog for the genesis is and was an all time classic. So why not put the original sonic game on a portable system such as the game boy? Sounds like a great idea and all, but when its put together with small screens and fast scrolling you get (besides sore eyes) not at ALL close to the best sonic game. I also noticed that (whether or not this was the specific cartridge or the game itself), this game froze faster then sonic running into a freezer. However, Saving IS a welcome addition. The new "Anniversary mode" did not seem at all different from original mode. Avoid this game, try a sonic/genesis collection to get your sonic within you refreshed. 4/10
This game is one of the greatest games on the genesis. Just having this game on GBA makes it a great classic thats now replayable on the go. People who don't have the genesis are now avilable to play it without using an emulator.