To start, press the green flag. then, follow the instruction the thumbnail; press space. lastly, click on the head, whichever one, and, depending on which one you click, you will get an Undertale LC fight. But Sans will make sure that the click to start the battle... will be your last! also, hold down the space bar to have 999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 hp.
Thanks to Toby Fox for creating the all-original game, Undertale.
