Design and drive a Dark Knight Tumbler

Confusingly this is Tumbler, not Tumblr.  Tumbler is the car in the Dark Knight films, and to promote the new one there is this excellent site that lets you design your own, and then drive it around a disused warehouse.

A few years ago it would have stopped at the design stage - letting you drive your creation is something very new, I think.

I'd love to know if there are any Easter Eggs in the game, or any cheats - can you get out of the room, for example?

Play here; drive BatTron here