Sonic with no speed= do not buy!
Now I don't own the GG Version, but just from playing it on the PS2 with Sonic Mega Collection Plus (Really?), I doubt anyone would go out and buy a GG just to play this piece of garbage.
Dr. Robotnik has taken your speed shoes away ( why not just kill sonic and stop him once and for all?) and you go around walking at the speed of a snail.
You need to collect keys in each level to progress in each zone, with a time limit!
And just to annoy you, they show a video of Sonic rolling really fast on the intro.
The music is unacceptable, The objectives are boring, Sonic has no speed, The controls feel broken, I could go on and on about how unbearable this game is, but I have better things to do.
If you wanna give yourself a migraine, get this game. Otherwise, if you find a copy, burn it before someone does.