This is a pen. . . that's it.
click green flag to start and then use arrow keys to move the pen also click the pencil to erase your work and press space to stamp, don't forget use a and d to increase the pens thickness. If you press w you can put the pen up and if you press s the pen goes down. There's more! Press 1 to change the colour, 2 to change the saturation, 3 to change the brightness and 4 to change the transparency. And pressing r resets everything (if your on phone or tablet then WOMP WOMP!).