This is a very fun way to learn and get better. It's still in a very active development stage, so things go up-and-down regularly (which sucks when you want to

This is a very fun way to learn and get better. It's still in a very active development stage, so things go up-and-down regularly (which sucks when you want to get your fix), but it's mostly been awesome while I've used it the last few months or so. If you do try it out, one of the best parts is adding your own "kata" — basically the games or tests. You will learn a lot by writing them (the community is very active in helping users improve description text and test cases). And there's nothing like seeing someone come in and absolutely blast your best effort out of the water with something even more amazing.