This project adds toppings to the pizza dough every time a person presses the keys "1", "2", or "3" on his or her keyboard. I wrote this project to work with a special keyboard extension I built. It wraps a cardboard-based Skeeball machine around your keyboard. This lets you roll a ball over keys instead of pressing them yourself. I am making a project called "Make Skeeball-inspired Games Using Pizza Boxes, Party Favors, and a PC" for the instructables.com website. The document shows people how to build the keyboard extension I made for this project. http://www.instructables.com/id/Make_Skeeball_inspired_Games_Using_Pizza_Boxes_Pa/.Enjoy!