Not the greatest game out there, but still a fairly decent game.
While Sonic 1 for the game gear had some aspects from the Mega Drive version, Sonic 2 for the game gear had barely any similarities with the original Sonic 2 at all. This included the quality of the level designs unfortunately.
You start out in an underground zone, which is really a bit stupid for a sonic game. The classic green hill esque level isn't until level 4. The level design is really not all that great; there's not much in the levels that is of much interest. While most of the levels in a sonic game are great speedy rollercoasters of levels, the levels in this game is basically going along straight platforms, and battering rocks, and going up springs; nothing overly special.
However, there are things like loops in the Green Hills zone which didn't make it to sonic 1 for the game gear. The game is also quite challenging, and not a cheap hard either. a sort of cat mario type of hard (not nearly as hard as cat mario though.)
Overall, this game is quite decent, but there are better game gear games.
Graphics: 4/5
Gameplay: 3/5
Music & Sound: 4/5
Controls: 3/5 (No spindash!!!)
Entertainment: 4/5
Overall: 17/25
7/10