Ok, this game ticked me off. It didn't do anything like unforgiveable, but I got all the Chaos Emeralds...and the final zone didn't pop. There's only 6 special stages so I was expecting the last one to be plot, but I guess not. And I am NOT REPLAYING these special stages. They seriously make this game go from a fun romp that bridges the Classic and Modern games to HELL WHERE YOU WILL BE SAVE STATING OVER AND OVER AND OVER. Neo Geo Half Pipes are the worst. Do not go for full completion here, just play it. Because stage wise? It's fun! Kinda a retread of Sonic 2 plot wise with Knuckles also being here with a boss fight I liked. His sprite art was also great. It all is here, the characters have their classic proportions, but the colored eyes. It's cool. Eggman even changes outfits midway through. It's a shame this game isn't canon though, due to it kinda being in legal limbo between SNK and Sega. I view it as a cool bridge between the classic and modern games. Definitely worth a play for history’s sake.