Code with testing in the browser
In particular look at
Just so you know, this idea of sabotaging the code comes for a past participant so hate him, not me. That being said... there is a MISTAKE in the code (Aha!). It's subtle but when you look away the code does not go back to it's original size. Fix it to be safe cube wizard!
Feeling lonely? Go on to Mission 4 to bring friends along! (bit harder so you better have done everything else properly before)