Collect all the coins without getting trapped or squashed! *** Level Designer *** To enter the level designer, run the game and then hold down [Z] and at the same time then press [0]. You can press [0] again at any time to begin playing your level for real, and then [Z] and [0] together to go back to edit mode If you want your levels to be saved them make sure you have remixed, then press [0] to ensure the level saves to the List, and then save your changes to the project.