Teenage Mutant Ninja Turtles: Smash-Up

Teenage Mutant Ninja Turtles: Smash-Up (also known under the working title TMNT Fighters) is a new fighting game, and has so far only been confirmed for Wii. It has been in development for about a year, and is being developed by Game Arts, who had previously worked on Super Smash Bros. Brawl, and members of Team Ninja, who previously worked on Ninja Gaiden II. The full title of TMNT Smash-Up was announced on January 23, 2009. The game will not be specifically tied to any previous Turtles license, yet bears the same artistic style as the 2007 CGI movie, TMNT.

The game is a 4-player fighting game and will be the third TMNT fighting video game. It will be a 2.5D platformer-inspired game, similar to Super Smash Bros. It will feature life bars, although characters can be KO'd by falling off the stage. The game stresses interaction with the environment, and stages in the game feature traps, changes to the stage itself, and interactive elements. Like the series, the game will also feature items including life-restoring pizza and "ninja magic" that grant players special abilities like fire breathing. Characters will be color-coded on-screen via a glow effect to help players keep track of their character.

Modes confirmed to be in the game include a Story, Battle Royale, Tournament, Winner/Loser Out modes, and Practice, as well as an online mode for four players. UbiSoft has commented that they are "planning several different modes of play designed specifically for single player". The game will also include unlockable modes.

The story of the game will be written by TMNT co-creator Peter Laird. Mirage Studios will make character selections for the game, and the roster is said to include characters "you know well in addition to surprise characters you certainly wouldn't expect."