I found the key before i entered, i've opened the chest, cleared all rooms, but the quest has not been completed!!! the only thing that hasn't happened is the barrier to the 4 candle room is still there - not sure if it's meant to be. All 4 candles now permanently lit (along with all the rest). Used button to exit room i was teleported to. All chests unlocked. Can't find any other buttons anywhere.
