Though small in number, the majority of the battle grounds in Smash-Up are a joy to play. They change as the fight progresses, and feature environmental hazards like buzzing bee-hives, collapsing towers, and snapping alligators. The best of the bunch takes place on the deck of a luxury cruise ship, which crashes into an iceberg, before shifting onto the back of a large whale. The only drawback is that the majority of the fights are over much too quickly, so you won't always get to see all that a particular stage has to offer.

One of the major draws of the Smash Bros. series is nostalgia, and sadly, this aspect is completely ignored in Smash-Up. Despite the rich twenty-five year history of the franchise, Smash-Up features the more recent incarnations of the TMNT cast, as seen in the 2007 CG film. There are few unlockable characters, and none are surprises. While it's nice to play as Shredder or the Night Watcher, throwing in a few classics like Bebop or Rocksteady would've be much appreciated.

Overall, Smash-Up doesn't break any new ground, adhering to the groundwork laid by Smash Bros., albeit with less content and less polished gameplay.