Knuckles Chaotix suffers from one huge problem, bigger than the physics, bigger than the random level selection, bigger even than the premise: the level design. The levels are far too vertical, and not even good at that; their focus on upward movement is a chore, and running up dozens of quarter pipes for the sake of reaching the next platform gets old real fast. This problem was even apparent as far back as Sonic Crackers. None of the layouts really have any identity of their own, to the point that you could swap the art and music assets in pretty much any two levels and likely not even notice the difference. The levels are extremely sparse, with not nearly as many badniks or objects as seen in pretty much every other Sonic game ever. It's a shame, really. The art in this game is gorgeous, the music is fantastic, and the concept is unique. But to make it fun would pretty much require brand new level layouts throughout, at which point you might as well be making an entirely new game.