To draw with a color, hold down the corresponding number key and drag your mouse around. To erase, hold down space and move your mouse around.
I've been wanting to make a monochromatic project for a while, so here it is! If I reach 10 likes/favorites I will make... something good, I don't know what yet. UPDATE 3/31: 11 likes/favorites- my most popular project! Thanks everyone! I guess I have to make something good now... maybe something with pen? OK I MADE THE THING IT'S CALLED "SOMETHING COOL" and it has no pen WHATSOEVER
