It's CBT but it's actually open to anyone with an account.

If you liked Kart Rider, it has pretty much the same feeling. Most items work in a similar manner and the like, it's what could be called a "clone", so you will feel right at home.

I played it a lot during the 1st CBT and I had tons of fun. It was quite empty, though, so hopefully there will be more people this time. :3

http://transpee.gamehi.com/