Not too old for this

I am an adult (with a child in college) who is finally going back to school. I was told I needed to pass an algebra placement test and started to see what what out there to refresh. So far, this game is just what I needed. I'm only on level two, but have two weeks to see how far I can go! The game really breaks down the basic rules: what you do to one side you do to the other and the goal is to isolate X on one side of the equation. The dragons are cute and alien like.