You can play as either Sonic , Knuckles , Tails or his evil twin. Sonic searches for the chaos emerald and wants to stop Dr. Robtnik from destroying the world. The character can climb walls, fly, jump, swim and of course kick some butt. In game puzzles are fairly easy, nothing new here. None of the puzzles are very hard, and the game isn't very long, although playing with different characters lengthens the adventure.
Graphics are very good with clean presentation and some very nice details.
While not a dramatic improvement over the original, this game still flies, and makes us wonder why more Dreamcast games weren't so convincingly killer in the graphics department. Sound is outstanding with cool music, voices ,effects, and environmental sound all very well done. My final thoughts on Sonic 2 are that this game is enjoyable . If you liked Sonic Adventure, then I would say you will enjoy this one. It's too bad the Dreamcast is not putting out too many quality games.