[mrkajz44]

Challenge mode for Vosik dropped somewhat unexpectedly today. Still a bit fuzzy but it looks like this is what is required:

-The bombs that drop at the end of the DPS phase must be used to lock the safe room
-2 safe rooms must be used for each DPS phase (since there are two bombs dropped at the end of the DPS phase, each one must be used to close the door
-All 4 rooms must be used before Vosik goes down (i.e you need exactly 3 DPS phases)

So it looks like the fight will be as follows: adds, DPS, 2 safe rooms, adds, DPS, 2 safe rooms, adds, DPS to kill

Also seems you need to be 390 LL or higher to one shot the door with a bomb.