Second version of J, J & BUM Fortress Chapter boss-battle arena level (Ganderoleg C3 LBossB V2) is uploaded to SkyDrive.
One of the problematic thing about this level is the Boss (spider-like monster). While chasing the players, monster just goes through arena wall & falls down through the wooden path
The small action that triggers the battle music ones player enters the arena is no longer active since Ivan asked me to wait until he composes a new battle theme.
Also I've made a video that shows first solutions of level-fail (followed by level restart) sequences for J, J & BUM..