What do you guys think about adding extensions or take home problems? Any ideas?

One would be to add a timer to the multiplication game:

import time, datetime, random
start_time = datetime.datetime.now()
typing = raw_input('>')
end_time = datetime.datetime.now()
difference = end_time - start_time
print difference.seconds

What about whole take home projects? The CoderDojoSF has a tic-tac-toe walk through: https://github.com/CoderDojoSF/tic-tac-toe. Maybe we could point them to this after Day 3?