Strange...

[Xenzix]

I've recently started to go back and farm some Swamp levels.... And noticed I couldn't access Bayou Boss Brawl.... So decided to finish all levels to ensure I could...

Still can't access.... Is there some other requirement I'm missing, as I've done all swamp levels totally through, even when I was in lvl 30's....

I think this is strange... Am I wrong?

[Major]

Well if you have killed all of the enemies in all of the maps prior to it then you should be able to go to it. Try doing Mardi Growl, the map before it, and when completed press the go to next level button. If this doesn't work you may have to email support.