behold!!!!
http://www.google.com/translate?hl=en&ie=UTF8&sl=auto&tl=en&u=http%3A%2F%2Fw.livedoor.jp%2Ffantasica%2Fd%2F%25B3%25D0%25C0%25C3
the jp server had this arena split into two parts. the first part had the restriction of 20DC or lower. the second half had no restriction.
the jp server also had a 5* bt reward at 100,000 points, thats 10 rounds going all the way baby.