Under rating threshold (hideshow)
Mode 1 seems to make only the tip of the last line draw - like the end of a pen or paint brush. Mode 2 makes the entire line become a drawing surface like a piece of chalk. Mode 3 makes every line draw simultaneously (not just the line at the end).
x2 mode makes the last line draw from both ends at the same time.
Hope this helps.
Under rating threshold (hideshow)
If you move your mouse quickly out of the game screen, your little pencil thingy keeps moving, and slow patterns can continue while you do something else. Who knew this could be an idle game?