azumanga daioh has a ton of really great doujin games, and this one is absolutely rockin'. the characters all have their own little endings and the courses and sprites and everything are just such a great love letter to the series. it's pretty hard and there's a really easy exploit to pull off accidentally wher eif you fall off the course most of the time you'll end up way ahead of where you'd be if you just raced normally but hey, it rules.