Click on the pen and drag it-you will see what happens! Use up, down, left, and right arrows too move as well a dragging the pen. Space to erase! G to ghost the pen- it will still work- just use the arrows B to make the pen visible Experiment with it!!!!!
Sorry that the backgrounds not the best, it makes the colors stand out more, though I hope you like it!!!! PS using the arrows might be a little glitchy