In the game Burger Stack, you have to stack as many ingredients between the two halves of the burger bun. Begin by piling the bacon, lettuce, cheese, pickles, onion rings, and of course the burger patties onto the bottom half of the bun. Once you get to layer 20, you can slap on the top half of the bun. Move on to the next burger and see how many burgers you can stack without the whole tower toppling over. The more crooked the layers, the worse the wobble, so try to drop all the ingredients neatly onto the bun.