I think its funny that this is one of the few games IGN has given a 10/10 to in it's lifespan, and I can kinda see why they would rate it so highly. This game is very interesting in its circumstances of development and release. It is a 2D sonic game that had released in 1999, right as sonic was about to enter the 3D era, it's developed by dimps, who would later go on to make all the 2D sonic games for roughly next decade, and it functions as both a early glimpse into that kind of gameplay while also providing a decent compilation of classic sonic zones from sonic 2 that all play rather well. For its time, its a very solid game. Nowadays though, especially considering the fact this game hasn't been rereleased ever and you need to go hunt down a neo geo pocket color to actually play it, its not really worth that kinda hunt. While the rehashed sonic 2 levels were likely fresh in its time as a way to get portable sonic on a system that doesn't drink batteries like water, in todays day and age there are much better ways to get your 2D sonic on wherever you want. If you are curious enough to be looking at this review, then by all means go for it tho, games solid.