Left-click a tile on the screen to change it, and right-click it to change it back. Click the "Reset" button to start over. When you're finished, press the "print scr" button on your keyboard and paste the image into a picture editor (MS Paint for example). Crop the image down to have the entire grid below, and then submit the image to Tom O'Rourke as a PNG file with either your name or a nickname. If your level is accepted into the game, I will list your (nick)name in the game credits.