We apologize for the inconvenience! We are still in the process of transitioning lessons and inventions to our new Education site. This process may take some time to complete.
In the meantime, you can see some of our Arduino activities here:
DIY Etch a Sketch (this one also uses Processing, so therefore is a bit more complex)
Analog Pong (this one also uses Processing)
Please reach out to us if you need anything further!