Hell is Us includes 43 Mysteries that are required to be completed for the trophies/achievements Amateur Detective and Super-Sleuth.
Mysteries are generally puzzles in the game world, and can be completed at any time as long as you have the required items and can access their location. Generally these involve chests or doors that need keys to access, or solving puzzles with passcodes you obtain. Mysteries that involve passcodes can be solved at any time you have access to their location, even if you haven’t obtained the item which would provide hints to the solution.
None of the Mysteries are missable, so can all be completed after the story.
If you want to complete all Mysteries as you progress you can follow the Hell is Us Collectible Walkthrough and you’ll get all trophies in 1 playthrough. It includes all trophies, collectibles, missables, and explains how to advance the story objectives.
Mysteries
Mysteries are listed in the order they appear in the Exploration – Mysteries menu to make it easier to clean up after the story. Mysteries are generally displayed in the location they are solved, but this doesn’t always correspond to the location where they are started. There are a couple Mysteries that are listed under the location they are started, but are solved in another area.
Any Mysteries that involve passcodes of some form will go straight to the solution, skipping picking up clue items.
Senedra Forest
Mystery #1: Caddel Family Treasure
In Senedra Forest, go west up the hill from the APC toward the OMSIF camp. When you reach the camp look for the work light and then face the direction it is pointing where there is a small path up the hill. At the top you can find a red cairn where you obtain Key – Rusted.
From the camp take the path (not off the cliff) sticking to the left until you reach the blue stone cairn. Interact with the chest in front and use the Key – Rusted to receive Note – Caddel Treasure #3 and the Bracelet of Ecstasy – Wanton Destruction, completing the mystery.
Mystery #2: Secrets of the Ram
In Sendra Forest, follow the ruins around to the right where you can pick up note OMSIF Report – Ram’s Head and Ram Head Medallion – Crimson.
Go into the underground ruins through the trench area and in the second large room you can pick up Ram Head Medallion – Viridian on the right.
Keep going back through the ruins until you reach the door with the circles on either side. Place the medallions so the ram heads face each other to open the door and complete the mystery. In the room you can pick up Glyph: Recoil and Journal – Queen’s Decree.
Mystery #3: Lymbic Door – Senedra, Hilltop
In Vyssa Hills go to the Vigil Hideout and into the room with the stone coffin you enter during the story. On the box behind the coffin you can find Lymbic Rod – Grief, Z.
After you have completed the story events in Francis Church so have obtained the Mine – Key, go through the wooden structures to the scaffolding Near where you found Tania. Climb up and near the water tower is an entrance to the mine. At the bottom beside the ladder you can find a door where you can use Key – Mine.
Follow the path forward, then go through the next door on the left that requires a key. Defeat the enemy then unlock the door, and immediately across from it is a third door that requires the key.
Follow this path into the next area where the red-lit structure. Past the enemies on the right you can pick up Lymbic Rod – Grief, V and Note – Cryptic Maxim.
In Senedra Forest from the APC and follow the right wall around the hill to the ruins at the top where you can find a blue Lymbic door. Insert Lymbic Rods – Grief, V and Grief, Z to open the door and complete the mystery.
Mystery #4: Lymbic Door – Senedra, Underground
In Talju, go to the town hall and keep following the paths west to a playground area. Near the swing you can pick up Key – Talju House along with Ethnic ID Card – Lukhan that starts Mystery #27, but isn’t required to complete that one.
Head back to the north of town where the circled house is on the map you received from Boro Juven. Go around the back where there is a stairwell down with a door. Use the Key – Talju House to open it and enter. In the room you can pick up, Lymbic Rod – Rage, Z which starts this mystery.
In Marastan, go to the southwest corner of the town area where you can go through the basement of the house. Go into the backyard and follow the path up the hill until you can drop down into a cave. Follow the path through the cave, turning to the right when you reach the lights . When you reach the spot in the cave with the next enemy look left where there is a side path. By the ledge you can pick up a research item, along with Lymbic Rod – Rage, Y and Recording – Caspian’s Stalled Research.
In Senedra Forest, go to the location where you complete Good Deed #2: Forlorn Fate. In the same room you can find a Lymbic Door. Insert the Lymbic Rods Rage, Y and Rage, Z to open it, completing the mystery.
Mystery #5: Emergency Stash
When progressing into Arcas Spire, follow the path through the area until you reach the third save point on the wooden scaffolding. Instead of continuing down, go left into a cave and through the right side until you reach a ladder back up. At the top you can pick up Key – Rusted which starts this mystery.
Follow the path to the lowest level and the scaffolding right before the elevator. Go up the ladder on the right and follow the path around the pillar, then down the cliff to the right past the enemy. At the end you can find a chest where you can use the Key – Rusted, completely the mystery and obtaining 5 x Tuning Stone – Steady.
Mystery #6: Rightous Protection
Inside the Arcas Spire, follow the main path until you drop off some scaffolding to a large stairway covered in corpses. A short distance up you there is a hole in the stairway where there are enemies below. Drop down and defeat them, then pick up the Key – Brass to start this mystery.
Continue all the way to the top of the spire, then through the door at the back leading toward the elevator. In the room with the elevator, interact with the chest and use Key – Brass to open the chest and receive Defensive Item: Bracelet of Terror – Shadowstep, completing the mystery.
Acasa Marshes
Mystery #7: The Hermit
Go east of Jova east all the way to the Hermit’s hut, then directly south so the stone pillars. Facing east (the pillar with the point behind it) and then moving clockwise, the symbols you need to rotate to face the middle are: Two Spikes, Four Spikes, Circle, One Spike. The opens the hole in the middle of the stone platform allowing you to collect 5 x Tuning Stone – Steady, Glyph: Feed on Fear – Enhanced, Glyph: Perfect Guard – Enhanced, and Relic: Aarlon’s Last Stand completing the mystery.
Mystery #8: The Captain’s Office
In Jova from the building Rebecca is located in go to the one southwest with the white graffiti on the front. Go up the ramp and into the upper floor to get inside, and down to the first floor and interact with the fridge to obtain Bottle of Mead – Nearly Empty and start this mystery.
After Abbot Jaffer and Rebecca have moved to Lake Cynon after the events at Pathem Abbey, go to Lake Cynon to the building to the right of the area where you drained the water. To the right of where Abbot Jaffer is standing you can pick up Bottle of Mead – Full.
Go back to Acasa Marshes and in Jova go to the drunk soldier behind the house in the center of town and trade him both the Bottle of Mead – Nearly Empty and Bottle of Mead – Full to receive Key – Jova Office.
Go up to the roof of the building near the entrance of town and you can walk through to the other side, then use the Key – Jova Office to open the door, completing the mystery.
Mystery #9: Observation Outpost 08
From Jova, go northeast toward the locked camp area. Interact with the keypad left of the gate and enter 151991 to open the gate. Interact with the computer in the tent on the right and read the entry to complete the mystery.
Mystery #10: Martial Lineage
Go east of Jova toward the tree with the hanging bodies, then northeast toward the hill with the stone pillars and on the other side where you can find 4 white stone spikes and a doorway in the hill. Standing in the same position as the screenshot (facing the hill southwest with all pillars in front of you) hit the close left one, then go counterclockwise hitting the others so the last one you hit is the one beside the door. Hitting them in the correct order opens the door, solving the mystery. If you accidentally hit one out of order hit them all make them glow, then they’ll reset.
Mystery #11: The Protector
Inside Patham Abbey, close the Timeloop: Patham Abbey. After closing the Timeloop there are two items to pick up, on the left is the Golden Clover which starts this mystery, along with Research Item: Terracotta Oil Lamp.
Go back into Jova and make your way to the west corner of the area past the fences to reach the cemetery. In the northwest corner you can find a pillar that you can interact with and place the Golden Clover. Pick up that Scroll – Eulogy and Relic: The Bloodseeker from the hole that opens in the bottom of the pillar to complete the mystery.
Mystery #12: Enlightenment
This mystery involves interacting with five sets of torches spread around Acasa Marshes to open a door.
Go out the south side of town and go to the southwest where there is a stone tower in the middle of the marsh area. Go down the stairs where you can find some ON soldiers. Opposite the Lymbic Door you can find two torches on the wall. Interact with the left one to rotate it and light it up. Don’t touch the torch on the right.
In the room you open for Mystery#10: Martial Lineage, go back toward the exit where there is a dead end with two torches you can interact with. Rotate the one on the left above the dotted U shape so it lights up. Don’t touch the one on the right.
In Pathem Abbey where you speak with with Abbot Jaffer during Act 2, there is the door you can open with a switch. Just before it check the torches on the wall. Rotate the one on the right with the dotted wheel shape so that it lights up, don’t touch the one on the left.
Complete Mystery #9: Observation Outpost 08 to open the gate to the locked camp. Go through the camp and enter the cave on the left. Go down the hallway to the right defeating the enemies to find two torches on the wall. Rotate both of them so that they are lit up.
Go back into Jova and drop down the well in front of the house where Rebecca was located. Go down the second ladder to the lower catacomb area and in the large room with the candles you can find the final torches. Turn the left one so it is lit up, don’t touch the right one. If you’ve rotated all torces correctly there will be rumbling nearby.
Go back up the ladder and you can see that the door at the top is now open. Enter the room to complete the mystery.
Mystery #13: Lymbic Chest – Acasa, Vitalis’ Basement
In Jova, the Lymbic Rod – Grief, W can be picked up from the basement of Vitalis’ house where are required to go in the story.
In the Blacksmith Shop, look behind the red chest near Victor to pick Lymbic Rod – Grief, Y.
Go back into the basement of Vitalis’ house and interact with the chest, placing the two rods to receive Glyph: Lymbic Mending and completes the mystery.
Mystery #14: Lymbic Door – Acasa, Western Monument
In Jova, go down the well near the house where Rebecca was located, then follow the path southeast toward the gate leading back out to the street. Down the hallway opposite from the door you can pick up the Lymbic Rod – Neutral, Z starting this mystery.
Go east of Jova toward the tree with the hanging bodies. From the tree go north where there are some stone ruins with enemies nearby. In the middle of the ruins you can pick up Lymbic Rod – Neutral, X.
Go out the south side of town and go to the southwest where there is a stone tower in the middle of the marsh area. Go down the stairs where you can find some ON soldiers, along with the a neutral Lymbic Door. Place the rods in the slots to open the door and complete the mystery.
Mystery #15: Lymbic Chest – Acasa, Eastern Ruins
In Patham Abbey, follow the path all the way to the room where the Timeloop is located. On the right of the Timeloop you can pick up Lymbic Rod – Terror, Z which starts this mystery.
Go east of Jova and north of the tall stone pillars to the stone ruins at the edge of the area where you can find a green Lymbic Chest. Insert the Lymbic Rod – Terror, Z to open the chest and obtain Glyph: Lingering Pain – Enhanced completing the mystery.
Vyssa Hills
Mystery #16: Lymbic Chest – Vyssa Hills, Fort
After completing the story events in the Francis Church area, follow the stone tunnels back to the top of the hill. In the open area go up the steps to the right with the enemies and you can pick up Lymbic Rod – Ecstasy, Z which starts this mystery.
Go back down to the ruins area beside the Moon door with the shortcut back inside the gated area (if you didn’t open this earlier you need to reach it through the mines). On the upper level you can find the yellow Lymbic Chest, where you can use Lymbic Rod – Ecstasy, Z to open it and receive an Amine Prism – Theta, completing the mystery.
Mystery #17: Lucky Break
In Vyssa Hills, go back where the Timeloop was located and you can spot the mine entrance nearby. Go inside and follow the path sticking to the left. After the first split you can find a small opening with an enemy, and the Key – Rusted by a skeleton at the end, starting this mystery.
Continue following the path to the end where there is a door you can go through, then up a ladder and unlock a door in a building that allows you to more quickly get to the nearby chest later. Look southwest where there is a path leading up and left past some ruins. Follow it all the way left to the end where there is a second set of ruins with some enemies nearby. Use the Key – Rusted on the chest in the ruins to obtain a Lymbic Polearm and Research Item: Flower Medallion completing the mystery.
Mystery #18: Eternity
Go into the Vigil Hideout where Gildas is located and on his left there is a locked computer you might have spotted earlier. Interact with it and enter the code 241244 to unlock it. Read the entries to complete the mystery.
Mystery #19: Pilgrimage
In Plains of Mist go to the north of the area up the steps and then west toward where there are wooden steps leading up. On the platform with the ranged enemy you can drop down into the building where you can pick up Key – Barrel and Note – Exodus which starts this mystery.
In Vyssa Hills make your way northwest back through the stone tunnels until you reach the top of the area with the Hollow statues where the Timeloop was located. In the ruins you can find a chest and use Key – Barrel to open it and receive 2 x Tuning Stone – Steady and Glyph: Lymbic Slivers – Enhanced, completing the mystery.
Lake Cynon
Mystery #20: Lymbic Chest – Lake Cynon, Reservoir
In Acasa Marshes, go east of the location of the Timeloop, then go south where you can follow a road past some destroyed vehicles to where it is blocked off by fallen metal structure. On the left on a body you can pick this up.
In Acasa Marshes, solve Mystery #9: Observation Outpost 08 to open the gate to the locked camp. In the left tent in the camp you can pick up Lymbic Rod – Neutral, W.
In Lake Cynon go down into the reservoir and turn around from the entrance to the forge where you can find a white Lymbic Chest. Insert the Lymbic Rod – Neutral, W and Neutral, Y to receive Glyph: Wave of Wrath – Elite and complete the mystery.
Mystery #21: Lost Keys
In Lake Cynon, go to the area where you drained the water to enter the Lymbic Forge. Look to the right of the entrance at the bottom of the drained area to find Keys – Algae sitting on the ground.
Travel to Marastan, then from the APC go west up the hill to the next level of the area, then south down the road to reach Samo’s General Store. Go into the back of the store where there is a chest on the floor. Interact with it and use Keys – Algae to receive the Baseball Cap and complete the mystery.
Mystery #22: Safekeeping
After Abbot Jaffer and Rebecca have moved to Lake Cynon following the events in Pathem Abbey in Act 2, go around the back of the building near the lake where you can find Rebecca. In the now open room you can pick up Key – Rustic and Letter – Safekeeping which starts this mystery.
In Acasa Marshes go to the east side of the area where the entrance to Panthem Abbey is. Opposite the entrance is a doorway where you can find a chest. Use Key – Rustic to open it and receive Relic #27: The Panoptic Eudemon, completing the mystery.
Mystery #23: Lymbic Door – Lymbic Forge
In the Lymbic Forge, go into the first area with the 4 interact points on the pillar before the first lever door. Go down the sides of the room down the stairs. Follow the path to the back where you can pick up Lymbic Rod – Terror, Y from a chest.
go to the location with the wooden mechanisms used to drain the water. Drop down to the right side of the mechanism where there is a ranged Hollow on a wooden walkway. Beside it you can pick up Lymbic Rod – Terror, W.
Climb back up the ladder and go through the doorway to the west which will close behind you. Defeat all the enemies in the room and continue west to a dead end where you can pick up Lymbic Rod – Terror, X.
In the room with the wooden mechanism after fully draining the water, drop down to the lowest area. On the north side you can find the door that takes the three Lymbic Rod – Terror. Insert them all into the door to complete the mystery, then pick up the two items in the room to receive Glyph: Shriek of Terror and Glyph: Gluttony – Enhanced.
Mystery #24: Lymbic Chest – Lymbic Forge, Hall
In the Lymbic Forge go to the platform with the wooden mechanism that is used to drain the water, then drop off the right side. Go through the doorway to the west and follow it to the large room with the podium on the ledge. Go up the stairs on the right and drop down onto the balcony with the podium. In the next library room you can pick up Gear – Large the first time you were here and Lymbic Rod – Rage, W.
Go back to the room where you rotated the torches and through the door where you used the Owl key. In the room where the enemy was you can find the Lymbic Chest where you can insert the Lymbic Rod – Rage, W, obtaining Glyph #15: Nightfade from the chest and completing the mystery.
Mystery #25: Lymbic Chest – Lymbic Forge, Dormitory
In the Lymbic Forge go to the platform with the wooden mechanism that is used to drain the water, then drop off the right side. Go through the doorway to the west and follow it to the large room with the podium on the ledge. Go up the stairs on the right and drop down onto the balcony with the podium. Go through the locked door on the right to another library room where you can pick up Lymbic Rod – Neutral, V from the shelf.
Backtrack to the room where you placed the two sigils to open the door. Go through the door north, then up the stairs in the first room, continuing up the stairs to the north to a dormitory area. In the left area with the beds you can find the chest, placing the Lymbic Rod – Neutral, V allowing you to collect Glyph: Void and completing the mystery.
Talju
Mystery #26: The Hideout
Go south from the entrance of the town hall take the second left, around the second house where you can go up a ladder to the upper floor. Look up to the top right where there is a safe. Enter the code 34911 to open it and receive Recording – Agatha’s Diary and Defensive Gear: Idol of Rage – Contempt completing the mystery.
Mystery #27: History Lesson
In Lethe – National Library, turn around from the building and near the entrance gate you can find a safe sitting on a trash can. Enter the code 81643 to open it and receive Amine Prism – Rho, Research Item: Wooden Mask and Note – Caspian’s Mask, completing the mystery.
Mystery #28: Supply Chain
You first need to obtain the keys for the Pharmacy building. Go to the southwest corner of town where the playground is. Turn around from the swings and go up the stairs toward the big tree. On a body on the railing you can pick up Keys – Pharmacy.
Go to the Pharmacy in the center of town, and in the parking lot after completing the story events open the back door. Interact with the computer on the pharmacy desk and enter the code 91012 to access it. Read the single entry to complete the mystery.
Marastan
Mystery #29: Ill-Gotten Gains
Go to the southwest corner of the town area where you can go through the basement of the house. Go into the backyard and follow the path up the hill until you can drop down into a cave. Go left of the save point to find Key – Marastan Church and Note – Tithe, starting this mystery.
Where you go into the crypt under the chuch as required by the story, from the center room go down the hallway to the north taking the first right, then left to find a doorway, use the Key – Marastan Church to open it, completing the mystery.
Mystery #30: Lymbic Chest – Marastan, Ruins
Where you go into the crypt under the chuch as required by the story, from the center room go south into the hallway, then walk east to the end of the path where you can pick up Lymbic Rod – Terror, V from the alcove, starting this mystery.
Travel back to the APC from the save point at the start of the catacombs. Go west and then south back past the barn, then toward the ruins on the left. Go around the back where there is a wooden bridge leading to a small island, with a tunnel at the back. Go through the tunnel then on the other side you are in the ruins. Go up the nearby stairs and drop into the open center of the ruins with the two enemies. In the southeast corner is another set of stairs that leads up the walls, which you can follow to a second set leading to the area where you can find the chest. Insert the Lymbic Rod – Terror, V to open the chest, completing the mystery and obtaining an Amine Prism – Theta.
Mystery #31: Locked Down
From the APC and go east down the road to the end where there is a security booth. Interact with the computer and enter the code 4132 to unlock it. Read the entry “First Day” to complete the mystery.
Lethe – National Library
Mystery #32: The Conspiracy
Go into the library and upstairs to the computer room with the helicopter in the ceiling. On the desk on the right you can find a computer. Interact with it and enter the code 731596. Read the entries to complete the mystery.
Mystery #33: Suspicious Activity
Enter the building and go up the stairs in the entrance, then turn right to find the staff room. Enter the code 5055 to open the door.
Defeat the enemies, then go around the left to find Note – Blackmailed and Keys – Car sitting in the locker.
Go back outside the building and in the east corner you can find a blue car. Use the Keys – Car to open the trunk and receive the Baseball Cap along with Research Item: Pottery Fragment, completing the mystery.
Lethe – Ministry of Cultural Primacy
Mystery #34: Blackmailed
Follow the path upstairs until you reach the three-way split in the hallway. On the right is the room with the “Secretary” label with a woman sitting inside. To her right is a desk where you can pick up Keys – Ministry Car which starts this mystery.
Follow the main path through the area until you drop down into the lower floor. Go through the office area, then on a desk near the doorway, you can pick up Lymbic Rod – Ecstasy, Y.
Make your way back to the parking garage and to the lower level. On the left of the ambulance with the open back you can find a light blue car. Interact with it and use Keys – Ministry Car to open it and receive Lymbic Rod – Ecstasy, X and Report – Confiscation.
In Lake Cynon follow the path toward the Lymbic Forge. When you reach the room before the water draining mechanism turn north (this is a shortcut door, if you missed it earlier you’ll need to go around from the lower level). Here you can find a yellow Lymbic door. Insert Lymbic Rod – Ecstasy, X and Ecstasy, Y to open it and complete the mystery.
Plains of Mist
Mystery #35: Overgrown
Go up the path on the right, loop all the way counterclockwise to the dead end. To the right you can pick up Key – Mossy on a skeleton which starts this mystery.
Go to the stairs at the top of the area, then northeast. Beside the spot with the hole in the floor is a pathway with stone Hollow statues. Past it you can enter a building with a chest, where you can use the Key – Mossy to receive Defensive Gear: Idol of Ecstasy – Battle Trance and complete this mystery.
Mystery #36: Lymbic Chest – Temple of the Fallen
Follow the main path into the area to the platform where the Timeloop is located, then down the left path to the save point. Take the path leading east and stick to the right, dropping down the wooden platforms to the bottom. When you reach the open area follow the path around and at the end of the path you can pick up Lymbic Rod – Ecstasy, V which starts this mystery.
Back from above save point, this time take the path leading west, staying to the left. Defeat the enemies attached to the blue Haze in the room to clear a Timeloop Guardian, then continue up the path left behind where the ranged enemy was. At the end of the tunnel near a group of enemies you can pick up Lymbic Rod – Ecstasy, W.
Continue on the main path past the second pressure plate room, then down the area where you defeated a bunch of enemies. In the next room on the left you can find the yellow Lymbic Chest. Insert Lymbic Rods Ecstasy, V and Ecstasy, W to open the chest, awarding 5 x Tuning Stone – Strong and completing the mystery.
Mystery #37: Ascetic Vows
On the main path just after the room with the first pressure plates, ontinue through the door into the next area where there is a split in the path. Go east and then right into the hallway, where the is a ladder you can climb to a platform with a lever. This lever opens the door beside you, and the one across where the ranged enemy was located. Go back down and across to the other side of the area and climb the two ladders to reach the platform with the enemy, then drop off the left side. Follow the path and go right of the stairs until you reach an area with a bunch of enemies. Across the wooden bridge and then left you can pick up Key – Rusted which starts this mystery.
Follow the path southwest and into the room on the left where you can find a door. Use the Key – Rusted to open it, solving the mystery.
Jeljin
Mystery #38: Family First
In Jeljin go to the southwest of the area to the dig site and down one level to the ring door puzzle you passed prior. From top to bottom the solution is: Crown, Flower, Lion, Sheep. Opening the door completes the mystery.
Mystery #39: Lymbic Chest – Jeljin, Archeology Camp
In Lethe – Ministry of Cultural Primacy, go east of the APC is a white truck with the driver door open. You can pick up Lymbic Rod – Rage, V and Letter – Safe Delivery.
In Jeljin go to the southwest of the area to the dig site and down into the underground area. Follow the path until you climb some ladders and reach a save point. In the small room beside it with the flowers you can pick up Lymbic Rod – Rage, X.
Go back out to the dig site and you can spot the red Lymbic Chest on the back of a truck. Insert the Lymbic Rods -Rage, X and Rage, V to open it and receive an Amine Prism – Theta, completing the mystery.
Auriga Museum
Mystery #40: Great Responsibilty
On level B4 after closing the Timeloop, you can climb down a ladder and follow the path to a storage room with some items to pick up. First on the left you can find Symbol – Iron Crown which starts this mystery.
Go back to the entrance of the area in the room with the Hollow statues and on the south side is a doorway. Interact with it and place the Symbol – Iron Crown to open it, completing the mystery.
Mystery #41: Lymbic Chest – Lymbic Forge, Waterfall
On level B4 after closing the Timeloop, you can climb down a ladder and follow the path to a storage room with some items to pick up. On the right you can pick up Lymbic Rod – Grief, X and Note – Rho-021 which starts this mystery.
In Lake Cynon follow the path down to the Lymbic Forge in the room where you place the Keystones. On the north of the room between the two waterwheels there is a waterfall with a room behind it where you can find a blue Lymbic Chest. Insert Lymbic Rod – Grief, X to receive 3 x Lymbic Capacitor – Medium and Glyph: Delirium – Enhanced, completing the mystery.
Mystery #42: Lax Security
On level B1 in the room beside the Timeloop you can find a safe (beside the door leading back to the hallway using Keycard – Clearance Alpha) Enter the code 77777 to open it and receive Amine Prism – Theta, Amine Prism – Rho, and Drone Module – Distract – Elite, completing the mystery.
Mystery #43: Whistleblowers
On level B2 in the maintenance area, switch the power grid to Red. Go back to the door where the man was screaming and go through the door at the back. Hiding in the boxes beside the ladder you can find a computer. Interact with it and enter the code 051108, then read the entry to complete the mystery.
For all other Collectible Types refer to Hell Is Us Collectible Guide.
