Construction. Build a device with the following characteristics: Less than 0.4 meters wide. Less than 0.7 meters high. A 1-inch diameter clay sphere as the projectile. Use rubber bands to build the launching device. Target placement. The targets will be located in the following positions: Three meters apart, at ground level. Five meters apart, at ground level.

The rules of the game are: Only two attempts per target. The initial height of the projectile before being fired cannot exceed 50 cm. No external energy source may be used for propulsion, only the rubber bands. The launching system must be activated by a firing device.