Classic Side Scrolling Brawler
Streets of Rage 2 is one of those rare games that even if you pick it up years later (in my case, replaying it on the Sega Smash Pack for the Dreamcast) it is still a fantastically fun game despite its age.
As with most 2D games there isn't too much going on here. You have a lot of punching, kicking, jumping, and random food collecting and that's pretty much it. This game and the other games in its class stand out because they are able to pack a lot of different situations into the action that keeps the game interesting. Not to mention co-op is a hell of a blast and very challenging. Get your hands on it.