[ARC Raiders]Complete strategy guide to the hidden city key room! Thorough explanation of all 4 types locations, how to obtain, rewards, efficient lap routes[Ark Raiders]
ARC Raiders is a PvPvE cooperative survival shooter set in a desolate future world. Players play as raiders, collecting resources and crafting powerful weapons as they aim to escape. One of the best parts of this game is the key rooms scattered throughout each map. The particularly popular map “The Buried City'' has four types of key rooms, each containing weapon blueprints and epic rare items.
The Buried City is a map that imitates an urban area with dense buildings, and while PvP tends to be intense, there are many hiding places, so it is also recommended for beginners. However, the key room can easily become a nest for enemy players and ARCs (giant robots), and there is a risk of annihilation if you enter it without a plan.
In this guide, we will introduce all the key rooms in the buried city. We will cover how to obtain it, example rewards, routes, and precautions. We also suggest efficient routes specific to blueprint hunting, so please refer to them.
- What is the key room of the buried city? Basic information and importance
- Complete guide on how to get keys: Drop rate and efficiency spots
- 1. Hospital Key: Detailed walkthrough of the north 3F door
- 2. Residential Area Master Key: Grandioso Apartment North Building 1F Battle Area
- 3. Town Hall Key: Front door boss room level reward
- 4. JKV worker access card: Hidden high reward on the 4th floor of space travel
- Efficient lap route: 1 raid all key conquest plan
- Related information: Weapon cases & escape points
- Frequently asked questions (FAQ)
- Summary: Become unrivaled in the hidden city key room
What is the key room of the buried city? Basic information and importance
A key room is a special room that can only be opened with a special key, unlike regular containers. You can expect to receive more than 10 times the normal reward inside. In particular, cases have been reported where weapon blueprints (e.g. wolf pack, snap hook) and high-grade materials (arc operation core, sensor) are guaranteed drops. The four keys exclusive to Buried Town are as follows.
| key name | Place of use | Expected reward | Difficulty (PvP risk) |
|---|---|---|---|
| hospital key | Hospital north side 3F door | Blueprints/medical kits | Medium |
| Residential area master key | Grandioso Apartment North Building 1F | epic weapon parts | high |
| town hall key | Town hall front door (north side) | Expensive materials and blueprints | high |
| JKV worker access card | Space travel 4F door | Special tools/blueprints | Medium |
Just by visiting these key rooms, you can generate tens of thousands of coins worth of value per raid.
The advantages of the key room are as follows.
- Blueprint drop rate is high (there is a confirmed report in the rare key room)
- Selling price is 100 coins (when not needed)
- It is easy to accumulate crafting materials by going around.
Next, we will explain in detail how to obtain the key.
Complete guide on how to get keys: Drop rate and efficiency spots
The key is basically a random drop, but it is concentrated in certain places. The overall drop rate is low (about 1 per raid), so farming is important.
1. Obtain by exploration (most efficient)
Recommended spots are as follows.
- Dam Battlefield: Research & Administration building, Ruby Residence. It can be found in desk drawers, lockers, and corpses.
- Buried in the city: Guard posts, containers in residential areas.
Tips: Defeating enemy raiders in night raid mode will increase the drop rate.
2. Obtained by crafting
Materials: 5 advanced electrical components, 3 sensors, 2 arc operating cores.
Similar keys can be created in the workbench. The Buried City Key cannot be directly crafted, but it can be indirectly supported by sharing materials.
3. Purchase from a merchant (Shani)
Price: 9000 coins.
Limit: 1 piece per day. We recommend saving up coins and prioritizing purchases.
Efficiency Farm Route: Raid in the order of Dam Battlefield → Buried City. Collect the keys at the dam and immediately bring them to the buried city to use.
Now that you have the keys, move on to conquering each room.
1. Hospital Key: Detailed walkthrough of the north 3F door
Difficulty in obtaining the key: Medium (high probability for dam research building).
Usage location details:
- Go straight to the buried hospital on the west side of the center of town.
- From the main entrance, take the stairs or elevator to the 2nd floor.
- Proceed through the north corridor on the 3rd floor and find a door marked with a key (near the outside field storage room).
On the map: Go north from the hospital, and it's the door at the far right.
Live commentary: The ARC appearance rate is low in front of the door, but be careful of the raider fishermen.
Example of reward:
- Medical bags x3, blueprints (medium probability), and epic ammunition.
Strategy tips:
- Place a mine immediately after entering the room (Jolt mine recommended).
- Limit your search time to less than 2 minutes and head to the escape elevator.
- PvP avoidance: Approach silently and equip a silencer.
- Many location confirmation videos have also been released.
This room is easy to access and perfect for first kills for beginners.
2. Residential Area Master Key: Grandioso Apartment North Building 1F Battle Area
Difficulty in obtaining keys: High (emphasis on apartment drops).
Usage location details:
- Head to the Grandioso Apartments on the east side of the buried town.
- Enter the 2nd floor of the north building using the stairs or zip line.
- From the 2nd floor window, go down to the 1st floor using the zip line and open the key door.
On the map: East end apartment, under the north building elevator shaft.
Note: Direct entry to the outside on the 1st floor is not possible. Always come down from above.
Example of reward:
- There is a Wolfpack blueprint report. Many high-quality parts are available.
- There are many siege forces, and it is impossible to enter without a key.
Strategy tips:
- 2F reconnaissance is required. If the enemy is already inside, ignore it.
- Defend with door stopper + mine.
- When circling: simultaneous hunting with adjacent weapon cases is effective.
- Many strategy videos have also been released.
It is a sacred place for PvP, but the rewards are outstanding.
3. Town Hall Key: Front door boss room level reward
Key acquisition difficulty: Medium.
Usage location details:
- Head to the north front of the huge town hall in the buried center of town.
- Use the key on the closed door and enter.
On the map: Central large building, north entrance.
Vast interior: Multiple rooms, takes 5 minutes to explore.
Example of reward:
- Blueprints (Venator, etc.), large quantities of materials.
- Glitch alert: Backdoor entry may be possible.
Strategy tips:
- Sound Alert: Instantly destroy glitch intruders.
- Team play recommended: 1 person on guard, 3 people on exploration.
- Please check all rooms before escaping.
- Many strategy videos have also been released.
It's a high return due to its size, but please be careful not to run out of time.
4. JKV worker access card: Hidden high reward on the 4th floor of space travel
Key acquisition difficulty: Medium.
Usage location details:
- Head to the JKV Building (Space Travel) in the southeast part of the buried town.
- Climb to the 4th floor from the southeast entrance.
- Open the door.
On the map: Southeast Building 4F.
There are many climbs and the ARC risk is low.
Example of reward:
- Special access tool, blueprint.
- Suitable for farms with stable drops.
Strategy tips:
- It is possible to enter alone. Easy to defend in small rooms.
- Take advantage of adjacent escape points.
- Many full key strategy videos have also been released.
Balanced type that can be turned repeatedly.
Efficient lap route: 1 raid all key conquest plan
Recommended route (15 minutes):
- Spawn → Hospital (northwest) → Use the key
- Chuo Town Hall → Use the key
- East apartment → master key
- Southeast JKV → Use card
- Collect weapon case
- escape east
By mode:
- Night attack: High drop rate and weak ARC.
- Electromagnetic storm: Disables electronic equipment and has a stealth advantage.
Recommended equipment: Silencer, 3 mines, full recovery kit.
Related information: Weapon cases & escape points
The Buried City has duplicate weapon cases and key rooms.
Escape: East elevator, south gate. Be sure to check the remaining time.
Frequently asked questions (FAQ)
Q: Is the key room already empty?
A: It's fresh every reset. Excludes glitches.
Q: Too much PvP?
A: Prioritize reconnaissance when soloing, and share it with your team.
Q: Isn't there a blueprint?
A: The standard is 20 raids. It is a low probability luck game.
Q: Is another map better?
A: Buried City has great balance. Dam is specialized in obtaining keys.
Summary: Become unrivaled in the hidden city key room
The Buried City Key Room is a must-see spot for advanced players. If you master all 4 types, your blueprint collection will progress at once. Please take advantage of the route and take on the challenge with safety first. New keys may be added in updates. I sincerely hope that your raid will be a great success!
