Start: just type in a number or whatever and press Z for next line. If you choose genocide, then the battle starts. Battle: You have a soul, which is the heart, arrow keys to move it, you have to dodge a bunch of stuff (mostly bullets). Z to do damage when the rainbow wave thingymagig appears (only works if the line is touching a colour) Attack colours: White: Damages you Blue: Only damages you if you are moving Orange: Only damages you if you are not moving Grey: Does nothing but turns out into a white or red attack after some time (usually less than a second) Red: Instantly kills you
Note: There are 4 endings Credits: Whoever made Undertale Yellow
