According to Boardgame Geek:
Splinter has sent Leo, Donnie, Raph and Mikey on important missions: grab the Mutagen, find April, retrieve the AI chip... and pick up a pizza!
On the way, the Turtles team up to battle Kraang, powerful Mutants, and the insidious Shredder in a maze-like warehouse!
-Object: Be the first Turtle to complete your mission by collecting your Mission Tile and returning to your corner home space.
-Three ways to move! RUN through the warehouse, CLIMB onto stacks of boxes, and LEAP onto enemies!
-Customize the terrain by stacking boxes differently every game!
-Play your Action cards strategically!
-Before beginning the game players must place all the platforms on the board, as well as the mission as villain tokens as shown on the front cover of the rule book.
Each player selects his/her Turtle and receives a mission.
Players begin the game with a mission card and two random special action cards.
Each player begins the game in their turtles designated corner of the board. In turn each player rolls dice to move, leap or climb as you navigate through enemies and obstacles in search of your objective.
Players may attack enemies on the board and can even team up to defeat enemies. Defeating enemies allows players to collect additional action cards. Once they have found their mission tile, players must play a "Go for mission" card to collect their mission tile. The first Turtle to find their mission and escape back to their corner wins!
Sounds like a pretty good basis for a simple, self-contained game.
As it is, the game has great production values for its price. In the end its not a great game for a serious gamer, but it does have some great 3D terrain that is very portable and usable for any miniature game.
I'd probably upgrade it somewhat for my own purposes and even integrate it with my Space Hulk tiles.If that fails to float your boat, there are plenty of other game tiles out there online.
Another idea might be to make up a gridded "battle mat", set the 3D elements up on it and off you go.
You could even pack the whole thing away in a Pizza box.