Lego Catapult

1. Start with a base foundation.
2. Build the side walls to a good height and find a few long flat pieces for the lever.
3. Build a basket that can fit 1x1 bricks or larger for lego people.
4. You'll need 2 wheel parts to give the lever its tilt. Attach those to the centre of the lever and mount at the top of your walls.
5. Create a target, and begin to use the catapult.

‍

See the LEGO website for more details.