I did play the original, but basically completely forgot the mission. I died 38 times in my run, and completed it with 18s left on the clock. I will be going back in a few more times to try to flawless it before going for legend. Not sure I will try to solo legend though, Im not that good, but I enjoy the solo challenge in normal. There are a lot of hidden paths, so remember which one to take without dying is a bit tough. Near the boss there is also a door which does not have an interact symbol, so just be aware of that when you get to the vault.