Argh, Dragon Arena

[Sentinel]

can someone please tell me, why i cant open dragon areana, i have done all of the 11 characters, and my dragon arena aint showing up,, is it cause i need to complete each 11 charcters DU twice, or i need every character, or is it cause i finished their DU on the easiest mode, should i make the difficulty higher,, will that work..

thanks guys!!!!

[L.S.S Broly!]

wen u complete DU with all 11 players it opens. If it didnt on urs then u hav got a bugged version.