Level 3: Public Library - part 1 Ghostbusters Guide
Last update: 11 May 2016
Level walkthrough: You start the game in front of the library, so obviously you'll have to head inside. Ignore the first group of ghosts and don't worry, because you'll be given an opportunity later on to scan them. For now use the stairs to get to the upper balcony. Rejoin with the rest of the team and you'll find out that you've unlocked a Dark Matter Generator, as well as two attacks - Stasis Stream and Shock Blast.
Return to the ground floor and choose the PKE meter from your inventory. Scan the ectoplasm on the ground and then some of the objects from the environment. It should all result in Ectoplasmic Residue appearing near your position. Take the scan and then go back to the balcony. Turn left and proceed towards a newly unlocked passageway.
Keep heading forward, ignoring hints about the possibility of using your PKE meter. Turn right when you get to the gate and enter a large study area. Make a few steps forward and wait for a Book Golem to appear near your position. You can scan this mini-boss right now, however you'll also encounter other golems later on, so it's not a top priority.
I would strongly recommend that you start using your new attack called Stasis Stream during the course of this duel. Notice that your hits are slowing down the beast and thanks to that your allies on a nearby balcony can attack it. It would be a good idea to purchase upgrades before the start of this battle, especially the one that prevents this gun from overheating prematurely.
It shouldn't take too long for the golem to lose most of its health points. Once it has only one left switch to the Proton Gun and try capturing its head with an alternative stream. Slamming the head will allow you to win this duel as the rest of its body will automatically explode.
Proceed to the area where you've seen the golem for the first time and choose a door located to your left. Activate your PKE meter to find the first artifact - Portrait of Eleanor Twitty. Return to the study, however this time choose a door located to your right. Destroy wooden obstacles here and use the stairs to reach a lower floor.
Stop for a short while upon your arrival in a new area. Use your PKE meter and wait for the Librarian Ghost to appear. Don't worry if the ghost escapes, because you'll be given other opportunities to take a scan later on. Proceed to the nearest door and you should find your way to a room with a lot of book shelves.
Ignore the fact that some of the nearby shelves are going to be moved by ghosts, because sooner or later you'll find your way to your current destination. Head over to the exit and proceed to your left to find the second artifact - Reluctant Reading Lamp.
You should now choose a narrow passageway located between the book shelves. Get ready, because you'll have a chance to scan the Paper Construct ghost. Thankfully eliminating these ghosts is going to be very easy. Keep firing with your Proton Gun and use Boson Darts from time to time. Proceed to a brighter area to advance to the next section of the library.
Head forward. Ignore a small room with black slime along the way and instead proceed to a much larger warehouse. Make a few steps forward and get ready to defend yourself against Book Bats. Scan one of the bats and then choose the Dark Matter Generator from your inventory.
You can use either of the attacks of the generator to get rid of the bats. Firing the stream is more efficient against single wraiths and the blast attack is the best choice against larger groups. Keep fighting until you're the only one standing. Notice that a new phantom called Crusto has appeared near your position.
It's important to use your Proton Gun against Crusto. Thankfully a standard stream will be more than enough to weaken him. Don't forget that you'll have to trap him if you want to get rid of him once and for all. Wait for similar ghosts (Cruster) to appear and scan one of them. Start attacking them afterwards and get ready to defend yourself against new flying books as well.
Proceed towards the only available exit. Ignore weird occurrences along the way, because you won't come across any ghosts until you've entered a larger room. You'll be dealing with less powerful phantoms, so it shouldn't be difficult to prevail. Keep pushing forward until you reach an area with a purple mist.
Choose the PKE meter from your inventory and you'll be given a new chance to scan the librarian. Proceed towards the passageway with an EXIT sign above it and look around. Your main adversary will disappear once again and you'll have to neutralize a large group of flying books. Don't forget to use the generator here and keep fighting until it's safe.
Follow one of your colleagues to a new passageway once it's safe. Watch a cut-scene and head forward. You shouldn't be too surprised to hear that you'll have to neutralize other ghosts along the way. Eventually you'll come across a door. Open it and you'll find yourself standing inside a children study.