If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Its time to make yummy burgers! Look at the ingredients and click to build the exact burger one step at a time. When you've made your burger put it in a box to serve.
Alternatively you can use the number keys to build the burger and press enter to serve it. In the bonus round simply click as many drinks of cola as possible for extra points!
This game is played with mouse only.