Instructions:

Welcome to Etch-A-Berb! Use the A and D keys to control the left knob and move the drawing cursor left and right, and the Up and Down arrow keys to turn the right knob and move vertically. Just like the real toy, the knobs only control one direction at a time, so combine them carefully to sketch curves and corners. When you are ready to start fresh, click the Shake button to shake the screen, clear your drawing, and begin again.