1 for brown, 2 for red, 3 for orange, 4 for yellow, 5 for green, 6 for ice blue,7 for blue, 8 for purple, 9 for pink. When you change the colour of your pen the background changes to a colour that goes well with the colour of your pen! For example, when the colour of your pen is pink the background will be green! And press space to erase your drawing! Enjoy!
You do eventually run out of ink but when you press space it refills! :)