コンピュータの虫がある (I found a bug)

Well, I have enjoyed the site thus far, and as a whole, I haven't encountered anything that doesn't work at least as well as it should (most things work better). What I have found, is a minor exploit. In the user stats menu, if you click 'Lessons', you can access any lesson, even if you aren't the proper level. Anyways, it's not a major issue, but people who utilize the exploit could become bored by already knowing the vocab by the time it pops into practice mode. Once again, it's nothing major, but it does somewhat remove the sense of accomplishment that this site provides.