Home made mini catapults, a small block of wood with two nails and two rubber bands looped over the nails. Then some duct tape between the nails to create a pocket.
4 quarters and 4 cups with string criss crossing the top
A supply of jenga like blocks or other small blocks
Ping Pong Balls
Houston We Have Lift Off!
At Camp Gray they have the best simple ballistics game. They make catapults like Topher drew in the picture from small blocks of wood, a couple nails, rubber bands, and duct tape. Then each team builds a fort to protect their cups. Finally the battle begins. The game ends when one team has knocked both of the other teams quarters in to the cups with ping pong balls. GO BIGGER! Try this game out with more teams. Imagine 10 teams launching ping pong balls all over the place!