First, play the game (obviously). Make sure to choose the difficulty first. Once you select, all you need to do is to get an apple and finish it. Use WASD to move. There is a checkpoint. In case you die, you'll spawn where your checkpoint is. If you want to respawn immediately, press the 'W' in your keyboard. Make sure you need to stomp the red 'goombas' just like Mario. The more levels you play, the more harder it was. On the level editor, type any of these numbers to choose which type you want. Click anywhere to build. But the size doesn't fit accurately. We highly won't recommended to fullscreen it. Clicking on source code is recommended. so the costume size may fit accurately. But always prepare the lag. Or else your device will crash.