As the green-brothers move through the city streets, buildings, and other environments, you can't help but notice that though each type of area looks drastically different than the others, all of the streets and alleyways start to blend together, just like the various surroundings while inside a building or a lab. This hurt early on when one of the first missions was to roam the streets looking for Triceraton landing ships and destroy them. There were several times when either I thought I was needlessly backtracking and wasn't, or times when I really was going in circles.
As for the characters, they all look pretty good. Friend and foe alike resemble their TV-series counterparts, but there were plenty of times that I found myself following the wrong turtle with my eyes. Though all four wear their traditional colors of blue, red, orange and purple and carry the appropriate weapons, I still ended up losing track of which turtle in the green mass of attacks I was controlling.
Mutant Nightmare's sound department wasn't lacking and got the job done. The game's music, both the theme and in-game tunes, came off clear and sounded like some of the background music you would hear from the Saturday morning cartoon series. Another note is the fact that while in the heat of battle, the characters, both good and bad, don't really say much. From what I understand, this is a welcome change from this game's predecessors where the turtles would spout out the same few lines and battle cries over and over again to the point of annoyance.