This is a simple Lego Mindstorms game, no programming required!
It started out as a catapult, and the ball filled balancees are a remnant of that. The balls inside them fly out in all directions when they hit the ground. This is meant for NXT 1.0, except the balls are from 2.0. You can use marbles as a substitute. If anyone can adapt this for 2.0, I'd love to see a picture.
Step 1: Build!
This is done in the style of the official Lego Instruction Manuals. Any confusing bits have annotations to help you along.
Step 2: DONE!!!!