This level is hard, and full of unnecessary amounts of flood and cheap ways to be insta killed..! Between all the chain reactions and carrier floods I was loosing my mind trying to get past the 90 second hold out door on the third level, add in the fact the flood are infinitely spawning until the door opens, I genuinely suffered a lot and it killed 90% of my good runs which is why this level took me a total of 104 attempts.. and I stayed hidden during the third floor door. When it comes to the full game attempts I will learn to fight it out, I'm just super happy to be moving on from the library!