I know this is cheating, but this is what I do to get the medium badge. First, login your account (choose a server with low amount of people). Then, open up a new internet and go to Castlewars on a different site. create a new account and login. You should be able to vs. the account you just made made, and win. Not only do you get the badge, but you can also get a really good account off of this. I do it and I have 65 wins.
 "Tangerine Panic!"){kind=icon}
 "Castlewars"){kind=icon}
 "Cake monster"){kind=icon}
 "filler"){kind=icon}
 "Platform Racing 2"){kind=icon}
 "N3wton"){kind=icon}