Pause game play, then type Cheeseburger 104 to have unlimited health, all customers not getting angry, unlimited money, and all power-ups.
When you can choose new items for the menu, select the burger that is easiest to make. Wait for awhile to choose the bigger burgers. Before you start the level you will learn the type of customers for that level. Make sure the menu includes these burgers. For example, moms and kids want to order a fun meal. In those levels add the nuggets to the menu before starting. You can click to start the level and learn which customers will appear. Then click "Menu" and you can restart the level and the burger necessary to pass the level. Aliens like triple bacon cheese burgers with ranch.