Not sure if this exists, but thought I would put the idea out there. Can there be a way to count up points for daily challenges over time? (So you get a running total of your points... up to 6 a day). I think this would help inspire me to work on the daily challenges every day. I do think this is a great feature to help remind me of the various features on the site and keep my Japanese studies diversified.
It'll be your own little kao-chan that starts at level 0. She will grow bigger as you level her up by doing the daily challenges. We haven't started the artwork for that yet, but I already have a lot of ideas in my head for level progression.