[lemiant]

What about a game that was not on the floor {example:

Metal bars run width-wise along the field. The bars are about 1m (1 yard for you Americans) apart and 2m-3m off the floor. Robots start on raised platforms (like the bases of the towers this year), and are not allowed to touch the floor. There could be one (or a few) goals on each end of the field, and the aim is to get the playing pieces into the opponents goals. If you were an advanced team you could move from bar to bar to collect balls, but rookie teams could just travel back and forth along one bar, playing defense.
}

How's that for throwing a wrench in your drivetrain?

As an added plus it is themed after a game, FOOSBALL!