I absolutely love this! The interactivity of the exercises helps me understand the material MUCH better than from reading alone.
I wish all the sequences had exercises. If anyone reading this comment feels like writing something, but doesn’t know what to write, think of contributing some exercises. How awesome would it be for new people to LW if every couple of sequence posts, they could try things out for themselves?
When I finish with the sequences myself, I might try my own hand at creating some.