We taped a cardboard runway to a stack of books with a cookie sheet at the bottom (just in case we made a mess) then we also put paper towels to soak up any egg juice! :) Stage 1- First we rolled to eggs down together on one slide, neither one broke! Stage 2- Then we put one egg at the bottom and rolled another egg from the top of the slide, the one at the bottom cracked! Stage 3- Last we made another slide opposite of the first and rolled one egg from each slide... both cracked!