The moment you step into the Fatui Extraction Research Center, Genshin Impact shifts gears from standard combat rooms into a layered environmental puzzle that tests observation more than raw DPS. This facility is less about brute-forcing Fatui waves and more about understanding how its security systems were designed to lock outsiders out. If you rush through without grasping the logic behind the Keys With Notches, you’ll hit dead ends fast.
At its core, the puzzle revolves around gated progression, with entire wings of the research center sealed behind specialized mechanisms. These aren’t decorative locks or one-off quest items. Each Key With Notches is part of a deliberate sequence that controls access to critical areas, hidden loot, and lore-heavy terminals scattered throughout the facility.
What the Keys With Notches Actually Do
Keys With Notches are unique access keys tied directly to the Extraction Research Center’s internal security architecture. Each key corresponds to specific locked doors or control consoles, and the number and pattern of notches determine which mechanisms it can activate. This prevents players from brute-forcing the puzzle by grabbing a single key and opening everything.
Unlike common quest keys that disappear after use, these keys function more like permanent clearance badges. Once obtained, they can be reused on multiple devices that share the same notch configuration, making them central to backtracking and full completion. This design is intentional and rewards players who mentally map the facility as they explore.
Why the Puzzle Is Easy to Misread
The research center is built vertically and horizontally, with overlapping rooms, blocked corridors, and visual clutter from Fatui machinery. Locked doors often appear long before you find the correct key, which can make it feel like you missed something obvious. In reality, the puzzle expects you to explore side paths, optional combat zones, and lower-priority rooms before returning to previously sealed areas.
Adding to the confusion, some locked mechanisms look identical at a glance but require different notch configurations. If a key doesn’t work, it’s not a bug or RNG issue. It means you’re holding the wrong clearance level, and the correct key is still somewhere else in the facility.
How the Keys Tie the Entire Area Together
The Keys With Notches are the backbone of the Extraction Research Center’s progression loop. Finding one key often unlocks a new route that leads to another key, which then opens deeper sections of the complex. This chain structure is what connects optional exploration, combat encounters, and narrative terminals into a single cohesive puzzle.
Understanding this relationship early saves a massive amount of time. Instead of aimlessly clearing rooms or backtracking after every lock, you’ll start recognizing which areas are intentionally inaccessible for now and which ones signal that a key is nearby. From here on, every locked door becomes a clue rather than a roadblock.
How the Key With Notches Mechanism Works (Door Symbols, Order Logic, and Common Mistakes)
Once you internalize how the Key With Notches system actually communicates information, the Extraction Research Center stops feeling like a maze and starts behaving like a readable blueprint. Every locked door, terminal, and barrier is part of a visual language the game expects you to interpret, not brute-force. This section breaks down that language so you can make clean, confident decisions while exploring.
Decoding Door Symbols and Notch Patterns
Each locked mechanism displays a small emblem showing both the number and arrangement of notches it requires. These symbols are subtle, often mounted beside control panels or embedded into the door frame, which is why many players walk past them without realizing they’re providing the solution. The key detail is that orientation matters just as much as count.
A key with three evenly spaced notches will not work on a door that shows three clustered notches, even though the number matches. Think of these symbols less like a “quantity check” and more like a shape-matching puzzle. If the silhouette doesn’t line up, the mechanism will reject the key instantly.
The Intended Order Logic Behind the Puzzle
The Extraction Research Center is designed around soft gating rather than hard quest locks. Early areas deliberately show you higher-clearance doors so you mentally bookmark them, then funnel you toward side rooms and vertical detours where the correct key is hidden. This is the game teaching you the loop: observe, explore, return.
Keys are placed so that each one opens at least two things, one obvious and one optional. Opening the obvious path pushes main progression, while the optional route often leads to resources, lore terminals, or the next key tier. If you ever open a door and feel like it led to nothing, you likely missed a branching path in that newly unlocked space.
Why Backtracking Is Not Only Expected, but Required
Unlike traditional dungeon keys, Keys With Notches are meant to be reused across the entire facility. This is why the map folds back on itself with elevators, drop-down shafts, and one-way doors that later reconnect. The game expects you to remember where earlier locks were and deliberately return once you’ve upgraded your clearance.
This also explains why some keys are found in areas that feel “out of the way.” Those rooms aren’t optional padding; they’re the reward for players who pay attention to environmental cues and don’t tunnel-vision the main corridor. Efficient completion comes from treating the entire facility as a single puzzle, not a series of isolated rooms.
Common Mistakes That Waste Time
The most frequent error is assuming a key is consumed on use. Many players leave a door, thinking they need another identical key, when in reality they already have the correct one and simply missed the matching symbol. Always double-check the door’s notch pattern before leaving an area.
Another trap is trying to force progression by clearing every enemy encounter in hopes something unlocks automatically. Combat zones here are distractions, not triggers. If a door stays locked after a fight, the solution is exploration and symbol matching, not DPS or aggro management.
Finally, players often misread similar-looking symbols under poor lighting or visual clutter from Fatui machinery. Adjust your camera, get close, and rotate your view until the full emblem is visible. One wrong assumption about a notch layout can send you on a ten-minute detour that the game never intended.
Key With Notches Location #1 – Initial Research Wing (Entry Area Breakdown)
With the fundamentals out of the way, the first Key With Notches is deliberately placed where the game tests whether you’re paying attention to layout rather than enemy density. This key is obtainable almost immediately after entering the Fatui Extraction Research Center, but only if you resist the instinct to push straight down the main corridor.
Where the Initial Research Wing Actually Is
After passing the facility’s main entrance checkpoint, you’ll enter a wide room filled with inactive machinery, scattered crates, and a short combat encounter against standard Fatui guards. Most players naturally head toward the large sealed door at the far end, marked with a multi-notch emblem you can’t open yet.
Instead, turn your camera left as soon as the room opens up. You’re looking for a narrower side hallway partially obscured by pipes and a flickering overhead light, a classic visual cue Genshin uses to mark optional routes.
Navigating the Side Hallway Without Missing the Trigger
Follow this side passage and you’ll descend a short ramp into what the game internally treats as the Initial Research Wing. There’s no waypoint, no dramatic cutscene, and no elite enemy guarding it, which is why it’s so easy to overlook.
Halfway down the corridor, you’ll see a Fatui research terminal embedded in the wall, inactive but interactable. Activating it spawns a brief wave of enemies, usually a mix of Skirmishers rather than anything that demands burst rotations or I-frame optimization.
How the Key With Notches Is Unlocked
Clearing this encounter doesn’t immediately drop the key, and this is where many players assume they’ve hit a dead end. After combat, a nearby containment locker unlocks with an audible mechanical click, positioned directly opposite the terminal you activated earlier.
Open this locker to obtain Key With Notches – Tier I. The notch pattern is simple, a single horizontal cut with a shallow secondary groove, and it’s intentionally introduced here so players learn to recognize symbols before juggling multiple variants later.
Why This Key Matters More Than It Seems
Although this is technically the first key, it already demonstrates the reuse principle discussed earlier. The Tier I key doesn’t just open the obvious door back in the entry chamber; it also matches a secondary lock deeper in the facility that you won’t reach until much later.
Before leaving the Initial Research Wing, take a second to rotate the key icon in your inventory and mentally note the notch layout. That small habit will save you multiple backtracking loops once the facility opens up and similar-looking locks start competing for your attention.
Once you exit this wing and return to the main entry area, you’ll finally have the clearance needed to progress, but more importantly, you’ll understand how the Fatui intended this entire puzzle to be approached.
Key With Notches Location #2 – Lower Extraction Chamber (Vertical Navigation and Enemy Triggers)
With the Tier I key secured, the Research Center finally starts to open up in a more vertical, deliberately confusing way. This next key is positioned to test spatial awareness rather than combat output, and it’s where a lot of players lose time simply by moving too fast.
You’re heading downward now, into the Lower Extraction Chamber, a tall, cylindrical space that connects multiple locked routes at different elevations. If the first key taught you to read symbols, this one teaches you to read the room.
Reaching the Lower Extraction Chamber Without Skipping the Spawn
From the main entry area, use the Tier I key on the door positioned beneath the broken observation window, not the one along the upper catwalk. This leads to a freight lift shaft that drops you into the chamber’s mid-level platform.
Do not plunge straight to the bottom. The game checks for player proximity on the intermediate ledge first, and skipping it can prevent the enemy trigger from firing entirely.
As you land, you’ll notice faint red lighting and inactive Fatui machinery embedded into the walls. That’s your cue that this space is more about sequencing than raw DPS.
Enemy Trigger Conditions and Common Failure Points
Walk toward the central console on the mid-level platform, and a short delay later, a mixed group of Fatui Skirmishers spawns in from the upper gantries. They’re not dangerous individually, but their ranged pressure can easily knock you off the platform if you tunnel vision rotations.
Stay grounded and fight near the inner railing. Using knockback-heavy abilities or plunging attacks increases the risk of falling, which forces a reset and can bug the spawn if you return too quickly.
Once all enemies are defeated, listen for the low mechanical hum. That audio cue confirms the chamber has advanced to its next state.
Claiming Key With Notches – Tier II
After the encounter, a previously sealed extraction pod along the chamber wall unlocks. It’s slightly above eye level from the mid-platform, requiring a short climb rather than a glide from above.
Inside, you’ll find Key With Notches – Tier II. This one has a more complex pattern, featuring a double-step notch with a deeper vertical cut, clearly distinct from the Tier I variant if you’ve been paying attention.
Before leaving, rotate the camera and identify the two doors now marked as compatible with this key. One is nearby, tempting you to use it immediately, while the other is much higher up, foreshadowing a return once the facility’s full vertical loop is unlocked.
Why This Chamber Teaches You How the Puzzle Thinks
The Lower Extraction Chamber exists to punish impatience. Rushing downward, ignoring mid-level interactions, or brute-forcing movement without reading the environment can all soft-lock progression temporarily.
By forcing a specific elevation-based trigger, the game reinforces that keys aren’t just rewards for combat. They’re proof that you understood how space, enemies, and interaction zones are meant to interlock inside the Fatui’s design philosophy.
With Tier II in hand, you’re now equipped to start threading between vertical layers of the facility, and the puzzle begins shifting from linear exploration into deliberate route planning.
Key With Notches Location #3 – Restricted Upper Facility (Environmental Interactions and Hidden Paths)
With Tier II secured, the facility stops pretending this is a straightforward climb. The next progression point pulls you upward, away from obvious doors and into a space that tests how well you’ve internalized the extraction center’s environmental language.
This is where players who rush markers get lost, while players who read lighting, airflow, and machinery sounds move forward cleanly.
Accessing the Restricted Upper Facility
Return to the vertical shaft hinted at by the higher compatible door you likely noticed earlier. Use the Tier II key on the elevated access panel, which unlocks a lift cage rather than a standard door, a subtle cue that vertical traversal is now the core mechanic.
Ride the lift up, but do not jump off early. Several broken catwalks tempt impatient players, and missing the intended exit can strand you below with no reset prompt.
When the lift locks into place, you’ll enter the Restricted Upper Facility, identifiable by dimmer lighting, tighter corridors, and exposed coolant piping running along the walls.
Understanding the Environmental Puzzle Layer
Unlike earlier chambers, this area is almost enemy-free at first. Instead, progression hinges on environmental interactions: pressure plates, rotating vents, and energy conduits that respond to elemental application.
Look for floor panels with faint blue seams. Standing on them alone does nothing; they require a brief activation window triggered by nearby machinery cycling on and off.
Time your movement with the hum of rotating turbines. When the pitch rises, sprint across newly aligned vents to reach platforms that were previously blocked by air currents.
The Hidden Path Most Players Miss
Midway through the facility, you’ll reach what looks like a dead-end balcony overlooking the lower chambers. This is intentional misdirection.
Rotate your camera upward and you’ll notice a narrow maintenance ledge tucked behind a rotating fan assembly. The fan’s hitbox pauses briefly every cycle, giving you just enough time to dash through without taking damage.
This hidden path leads to a sealed observation room that never appears on the mini-map, reinforcing that visual awareness matters more than UI here.
Claiming Key With Notches – Tier III
Inside the observation room, interact with the control console to cut power to the ventilation system. This stabilizes the room and unlocks a reinforced storage locker along the back wall.
Open it to obtain Key With Notches – Tier III. This key features an asymmetrical triple-notch pattern, including a shallow diagonal cut that matches no previous lock you’ve seen, signaling its exclusivity to late-stage facility doors.
Before leaving, note the newly powered elevator shaft visible through the glass floor. It connects upper and lower layers, confirming that future routes will loop back through previously inaccessible spaces rather than pushing forward linearly.
Why the Upper Facility Changes the Puzzle’s Rules
This section strips away combat safety nets and forces players to engage with timing, spacing, and environmental rhythm. There’s no DPS check here, just awareness and controlled movement.
By hiding the Tier III key off the main path, the game teaches that critical progression tools won’t always sit behind elite enemies or glowing markers. In the Fatui Extraction Research Center, mastery comes from reading the facility itself as the puzzle.
Unlocking the Central Sealed Door (Correct Key Order and Door Alignment Explained)
With Key With Notches – Tier III secured, the facility’s layout finally converges. The powered elevator shaft you spotted earlier is your return vector, funneling you back toward the central atrium where the sealed door has been taunting you since the early minutes of the quest.
Ride the elevator down and follow the now-active floor rails to the circular chamber with three recessed key pedestals. This is not a simple “use all keys” interaction. The puzzle reads your input order and the physical alignment of the door rings, not just whether you own the keys.
Understanding the Door’s Alignment Mechanic
The central sealed door consists of three rotating rings, each etched with notch patterns that mirror the keys you’ve collected. Every time you insert a key, the corresponding ring rotates and locks into a new position.
What the game never states outright is that the rings persist between attempts. If the alignment looks wrong, backing out and re-inserting keys randomly will only desync the pattern further. This is why so many players think the door is bugged when it’s actually misaligned.
Use the camera to zoom in on the door. You’re looking for clean vertical continuity between the notch grooves across all three rings, forming a single uninterrupted channel from top to bottom.
The Correct Key Order (And Why It Matters)
Insert the keys in ascending tier order: Tier I first, Tier II second, and Tier III last. This order is non-negotiable because each tier rotates a deeper ring layer that can’t be corrected by later inputs.
Tier I sets the outer ring’s baseline orientation. Tier II adjusts the middle ring relative to that baseline. Tier III is the final lock, snapping the inner ring into place and checking whether all three grooves align.
If you start with Tier III or Tier II, the door will accept the key but rotate the ring into an unsolvable state. There’s no combat penalty here, just wasted time and mounting confusion.
Visual Confirmation Before Final Activation
After inserting Tier II, pause. Don’t rush to use Tier III. The middle and outer rings should now display a near-straight groove, slightly offset but clearly trending vertical.
If the groove angles sharply left or right, remove Tier II and reinsert Tier I to reset the sequence. The game quietly allows this reset as long as Tier III hasn’t been used.
Once Tier III is inserted correctly, the door emits a low mechanical resonance rather than the usual sharp click. That audio cue is your confirmation that the alignment check passed.
What the Door Unlocks and Why This Puzzle Caps the Facility
The central sealed door opening isn’t just progression; it’s validation that you’ve understood the facility’s core logic. Keys aren’t consumables here, they’re rotational modifiers interacting with persistent environmental states.
Beyond the door, paths reconnect to earlier chambers from new angles, reinforcing that the Fatui Extraction Research Center is a looped system, not a linear dungeon. If this door opens cleanly, you’ve solved the facility on its own terms.
Optional Chests, Lore Notes, and Missable Rewards Inside the Facility
Once the central door slides open and the facility’s looped layout becomes fully accessible, this is the point where thorough exploration pays off. Several rewards inside the Fatui Extraction Research Center are permanently missable if you leave the area or trigger the final exit without checking specific side rooms. None of these are required for puzzle completion, but they add meaningful loot, context, and achievement progress.
Hidden Chests Behind Reconfigured Pathways
After unlocking the central door, backtrack to the earlier coolant chamber with the rotating platforms. The newly opened passages subtly alter enemy spawn positions, revealing a side alcove on the upper catwalk that previously looked like a dead end.
Inside, you’ll find a Precious Chest guarded by a pair of Fatui Skirmishers that only spawn after the Tier III ring is locked correctly. Clear them out carefully, as the narrow walkways make knockback effects especially punishing. Falling doesn’t kill you, but it resets enemy aggro and wastes time.
Electro Barrier Storage Room Chest
Near the lower maintenance corridor, there’s a small room sealed by an Electro barrier that’s easy to ignore during the main puzzle flow. This barrier can only be disabled after the facility recognizes the correct key order, meaning earlier attempts will always fail.
Once the barrier drops, open the Exquisite Chest inside for enhancement materials and a chance at a four-star artifact. If you leave the facility without opening it, the barrier reactivates and the chest becomes inaccessible.
Fatui Research Logs and Environmental Lore Notes
Scattered across desks and wall terminals are several readable notes that flesh out the Fatui’s extraction experiments and their interest in notch-based rotational mechanisms. These aren’t quest items, but they add permanent entries to your archive once read.
One of the most easily missed notes sits on a console directly behind the central door you just unlocked. The camera angle naturally pulls you forward, so rotate it manually and interact before moving on. This note directly references failed Tier III alignment attempts, subtly reinforcing the puzzle logic you just solved.
Achievement Triggers and One-Time Rewards
Completing the facility with all optional interactions nets you a hidden achievement tied to understanding Fatui mechanical infrastructure. The achievement only triggers if you open every chest and read at least one research log before exiting.
There’s no pop-up warning if you miss this condition. If you teleport out early or finish the final exit sequence, the game flags the area as completed and locks the achievement until a future update reopens the zone, if ever.
Final Check Before Leaving the Facility
Before using the exit path beyond the central chamber, do a slow sweep of your mini-map for unexplored corners. Any unopened chest icons or unexplored fog patches inside the facility boundaries are your last chance.
The Fatui Extraction Research Center is designed to reward players who internalize its rotational logic, not just brute-force the puzzle. If you leave with every chest opened and every note read, you’ve extracted everything of value this facility has to offer.
Puzzle Completion Checklist and Troubleshooting (If a Door Won’t Open)
If you’ve followed every step and a door still refuses to budge, this is where most players realize the Fatui Extraction Research Center is far less forgiving than it looks. The facility tracks multiple internal states tied to key usage, door order, and even camera-triggered interactions. Use the checklist below to verify nothing slipped through the cracks before assuming your run is bugged.
Final Puzzle Completion Checklist
First, confirm you collected all three Keys With Notches from inside the facility, not just the two required to access the lower chambers. One key is easy to miss because it’s locked behind an optional side room that only opens after rotating a terminal to its Tier II alignment. If that door never opened, the key inside was never registered.
Next, double-check that each key was inserted into its correct terminal, not just any open slot. The puzzle does not accept brute-force attempts, and inserting a key into the wrong terminal temporarily invalidates the entire sequence. Even if the door animation plays, the backend logic won’t progress unless the order matches the research notes.
Finally, verify that you fully completed the rotational sequence on the central console after inserting the final key. Backing out of the interface too early, even by a fraction of a second, can prevent the game from flagging the puzzle as solved. Wait for the audible confirmation click before moving away.
If a Door Still Won’t Open
If the central door or side chamber remains locked, the most common issue is sequence contamination. This happens when keys are inserted in the wrong order earlier, then removed and reinserted without resetting the system. To fix this, remove every key, interact with the central console until it resets to its neutral position, then reinsert the keys in the correct order without interruption.
Another frequent problem is missing an interaction trigger rather than a physical item. Some doors only unlock after you approach them post-alignment, forcing the game to load the correct state. Walk directly up to the door after completing the sequence instead of fast traveling or swapping characters, as either can delay the trigger.
If you’re absolutely sure everything is correct, leave the facility through the interior transition door, not a teleport. Re-enter immediately and check the central console again. This soft reload often resolves desynced puzzle states without resetting progress or chests.
One-Time Lockouts and What You Cannot Fix
There are a few failure states you can’t undo. If you leave the facility after partially completing the puzzle and the game autosaves, certain doors may permanently lock for that world state. This usually happens if the final key was inserted but the console rotation was never completed.
Similarly, if you exit without opening the Exquisite Chest behind the central barrier, the barrier reactivates and cannot be disabled again. No amount of key juggling or relogging will reopen it. This is intentional and aligns with the Fatui’s one-use security design.
Quick Diagnostic Tips Before You Give Up
Check your inventory and confirm the Keys With Notches are no longer listed. If even one remains, it was never registered correctly. Also, review your archive to see if at least one Fatui research log was added, as this often correlates with proper puzzle progression.
Lastly, slow down. This puzzle punishes rushing more than combat encounters ever could. Treat it like a logic dungeon, not a DPS check, and the mechanics fall neatly into place.
Once everything clicks, the Fatui Extraction Research Center stands out as one of Genshin Impact’s smartest environmental puzzles. Master its logic, clear it cleanly, and you’ll walk away with both the loot and the satisfaction of outthinking the Fatui at their own game.