Level 1: Sedgewick Hotel - part 1 Ghostbusters Guide
Last update: 11 May 2016
Level walkthrough: Start off by following the rest of your team and ignore the fact that you can't use your weapon for the time being. Eventually you'll get to the elevators and you must use one of these objects to travel to a higher floor. Head forward and turn left when you reach a junction, because other passageways are inaccessible.
Watch out when you get to the staircase, because one of the ghosts will start throwing items at you. It's not a serious threat and you don't have to inspect the stairs. Instead head forward. Slimer is hiding just around the corner and you should lean out quickly to surprise it. Use your Proton Gun and keep firing at the ghost until it escapes once again.
Listen to a new conversation after which you'll be allowed to use a PKE meter for the first time. Start off by examining a purple stain on the wall and you'll find Ectoplasm. Proceed to the next corridor. Observe how your meter reacts and it shouldn't take too long for you to find out that the ghost is hiding inside the vase. Scan the object to scare it away.
It would now be a good time to scan Slimer using your PKE meter. Don't forget to keep pressing the scan key until you've received confirmation. You may proceed to the next section. Make sure to explore the area around the vending machine along the way, because you'll find the first artifact (Gustav Self-Service Tray) there.
Keep following your ally and you'll soon receive a distress call from Peter. It looks like he's hurt, but you won't have to get to him right away. Explore nearby corridors if you want to. Arrive near the elevators, approach Peter and press the action key to heal him. Make a few steps forward and press a button on the wall to call one of the elevators. Return to the ground floor.
Start running towards the lobby. Make sure to choose your PKE meter when you get there, because you'll be given a chance to scan one of Bellhop Ghosts. You may now start attacking the ghosts. Each time focus on a single target and don't forget that you can dodge their attacks.
I would strongly recommend that you start placing your traps on the ground, because otherwise you won't improve your statistics for capturing the ghosts. All the phantoms will soon escape and you'll have a chance to explore this area. Use your PKE meter near the reception desk and you'll find the second artifact (The Summoner Bell).
Notice that you can't reach the ballroom from here, so instead you'll have to follow Peter into the kitchen. Upon your arrival in the kitchen ignore flying objects, because you won't be attacked here. Instead inspect some of the nearby walls using your PKE meter and scan Black Slime.
Head on to the next room. Choose a narrow passageway near kitchen devices and notice that one of the wraith has blocked it. Move back and instead proceed to a door located to your left, because this new passageway is now unlocked. Turn right quickly when you arrive inside a new room. Use your PKE meter to scan Pappy Sargassi.
I would recommend that you keep using your PKE meter, because you'll be given a chance to scan other ghosts as well - Dead Fish Flier. Once this is done switch to your main weapon and fire at the ghosts a few times until they disappear. Approach a large object which is blocking your way and use Capture Stream ability to pick it up. Place it somewhere to your left.
You'll soon exit the kitchen. Ignore Peter's actions for the time being and explore a corridor located to your right. Get to the opposite end of the corridor and use your PKE meter to find the third artifact (Stay Puft Figure). You may now return to your ally. Head forward and it won't take long for you to reach the ballroom area.