This is just going to be a quick review since my net has been shotty all month. You are playing as Sonic as an effort to save your friends from the evil Ivo Robotnik who has turned them into machines. 
 
Sonic the Hedgehog Genesis for the Game Boy Advance is a real horrid game meant to be an anniversary tribute to the first Sonic the Hedgehog game but it comes with lots of errors in it that makes this game unplayable at sometimes. One point you are running and the camera will fail to catch up to you in time. 

OVERALL - F-
 
Like I said I decided to keep this review short and sweet and I did not bother to rate all the graphics, sound, controls, etc. That should already tell you alone that this game is a bunch of horse manure. I just decided to cut to the chase and give the game a rating of F- because while it is possible to go above A++ by using S's, I cannot give a lower grade than F-. I don't think U's really count much of a failing game but you know what I'll rate replayability just for fun.
 
REPLAYABILITY - F-
 
I rather have diarrhea **** in my ear than play this game ever again.

Nice AVGN reference, but yeah the game is garbage. But there is at least better ways of playing it like for instance the original genesis version or the mobile version released in 2013

I enjoy a good AVGN reference. Sonic Genesis would definitely deserve both a garbage review AND a brief one. One of the worst ports ever made, in my view.