Summary: Was a big fan of Sonic on the Megadrive and so tried this for my GBA, was very disappointed and returned it the next day for Super Mario Advance 4!!! Game play is very fast and it takes luck not skill to progress. I think you could move as quickly through the game with your eyes closed. Often, completely unavoidable spikes and other obstacles appear in your track.
Summary: I bought this game when it first came out expecting something really good. Instead I got this mindless game where you rush around with no real purpose at all. Its easy to get through levels you just keep running and jumping until you find the end. Boring. There's extra stuff to do but it seems incidental to the actual game. The bosses are strictly by formula for this type of game.