Last Updated: August 12, 2026
If a building in Beast of Reincarnation looks locked, the obvious answer is often to find a key.
But that isn't always the solution.
Some structures are opened with a colored key. Others are tied to story progression. And some apparently locked buildings are better understood as environmental exploration puzzles, where the real entrance is above, behind, or around the structure.
That distinction becomes especially important in the Ogouchi Buffer Zone, where vertical traversal, elevated terrain, broken structures and hidden routes can lead to loot that looks inaccessible from the ground. The game's exploration is deliberately built around vertical movement and alternate paths, including grapple routes and other traversal tools.
This guide breaks down how to tell which type of locked building you're dealing with, what the Red, Blue and Yellow Keys are for, and what to check before wasting time searching for a key.
Quick Answer: What Should You Do When a Building Looks Locked?
Use this order:
- Check the door interaction.
- Look for a specific key requirement.
- Walk around the entire structure.
- Check the sides and rear.
- Look above the building.
- Search nearby cliffs and elevated terrain.
- Look for broken roofs, walls or openings.
- Check for grapple or traversal routes.
- Only then assume you need a colored key.
A locked-looking door does not automatically mean a colored key is required.
That is particularly useful in Ogouchi, where vertical exploration is a major part of how collectibles and side areas are reached.
Table of Contents
- ➜ How Locked Buildings Work
- ➜ The Three Types of Locked Areas
- ➜ Red Key: Abandoned Village
- ➜ Blue Key: River Fork
- ➜ Yellow Key: Tailwater and Story Progression
- ➜ Strongbox Buildings: When the Door Isn't the Puzzle
- ➜ Strongbox #8: The Rooftop Route
- ➜ How to Recognize a Hidden Entrance
- ➜ Key vs. Route: What Should You Try First?
- ➜ The 5-Second Locked Building Checklist
- ➜ What to Do When You're Returning Later
- ➜ FAQ
How Locked Buildings Work
One of the easiest mistakes during exploration is treating every inaccessible building as a conventional key puzzle.
The game doesn't always work that way.
Beast of Reincarnation uses relatively large, vertically structured environments with multiple traversal options. Grapple routes, elevated terrain, bridges and other movement mechanics can change how you approach an area.
That means a building can be:
- Locked because you need a key
- Blocked because of story progression
- Accessible from another direction
- Accessible from above
- Connected to a hidden side route
- Part of an optional exploration path
This is why repeatedly checking the same front door isn't always productive.
When you encounter an apparently inaccessible structure, ask:
“Where does the level designer expect me to approach this from?”
That question is often more useful than immediately searching your inventory for a key.
The Three Types of Locked Areas
For practical purposes, you can divide the game's inaccessible structures into three categories.
1. Genuine Key-Locked Doors
These are the easiest to understand.
The door is associated with a particular key, and the intended solution is to obtain that key and return.
Examples include the Red Key and Blue Key optional access points.
2. Story Progression Gates
These aren't simply optional buildings.
They are connected to the game's progression and may require specific objectives, items or abilities before you can continue.
The colored keys become particularly important here because they eventually contribute to progression through the sealed gate leading deeper into the Ogouchi/Subcity route.
3. Alternate-Entry Buildings
This is the category players can easily misread.
The obvious entrance may be inaccessible, but that doesn't necessarily mean you need a key.
Instead, the intended route might involve:
- A rooftop
- A broken wall
- A nearby cliff
- An elevated platform
- A grapple point
- A side passage
- A damaged section of the building
The game's vertical traversal systems make these approaches possible.
Red Key: Abandoned Village
The Red Key is associated with an optional locked area in the abandoned village.
This is a good example of a genuine colored-key interaction.
The basic relationship is:
If you have already obtained the Red Key and remember passing a locked structure in the abandoned village, this is one of the places worth revisiting.
Blue Key: River Fork
The Blue Key provides another useful example of how the game's optional locks work.
A locked structure near the River Fork area can be opened using the Blue Key.
This is important because it gives you a useful comparison when exploring other buildings.
So if you encounter a door that behaves like a conventional key lock, searching for the appropriate colored key makes sense.
But if there is no obvious key relationship, don't automatically assume the same solution applies.
Yellow Key: Tailwater and Story Progression
The Yellow Key is more closely associated with the later portion of the Ogouchi progression.
Its route involves the Tailwater area and additional access requirements.
A simplified progression path is:
The important point is that the Tailwater Key and Yellow Key are separate items.
The Tailwater Key provides access to the relevant area, while the Golem is associated with obtaining the Yellow Key.
Keep them separate:
Tailwater Key = access to the relevant route
Yellow Key = colored key obtained afterward
The Yellow Key also becomes important for the larger progression involving the sealed three-key gate.
Strongbox Buildings: When the Door Isn't the Puzzle
Strongboxes are where the distinction between key puzzles and environmental puzzles becomes especially useful.
A building may look like it has one obvious entrance:
The natural reaction is:
But that can be the wrong interpretation.
Instead, look at the surrounding environment.
Check for:
- High rocks
- Cliffs
- Broken roofs
- Missing walls
- Upper platforms
- Grapple points
- Damaged sections
- Nearby structures that provide height
The game rewards this kind of environmental reading because its exploration frequently uses vertical routes and multiple levels.
Strongbox #8: The Rooftop Route
Strongbox #8 is one of the clearest examples of why you shouldn't automatically equate a locked door with a missing key.
The structure near the village/bridge area appears inaccessible from the obvious ground-level approach.
Instead of focusing on the front entrance, look at the terrain surrounding the building.
How to reach the Strongbox
- Find the building near the village/bridge area.
- Search around the nearby elevated terrain.
- Climb onto the higher rock formation.
- Use the elevation to reach the roof.
- Look for the damaged section of the roof.
- Drop through the opening.
- Search the interior.
- Open the Strongbox.
Strongbox #8 reward
The reward makes the location worthwhile even if you're not trying to complete every Strongbox.
How to Recognize a Hidden Entrance
When a structure appears locked, use the surrounding environment as a series of clues.
Clue #1: Elevated terrain
If there is a large rock, hill or ledge immediately beside the building, that's worth investigating.
Ask: “Can I use this to get above the entrance?”
Clue #2: Damaged roof
A broken roof is one of the strongest environmental clues.
If you can see:
- Missing roof panels
- A hole
- Broken wooden beams
- An exposed upper floor
then investigate from above.
Clue #3: Broken walls
Don't only inspect doors.
A damaged wall can indicate an alternative entrance or traversal route.
Clue #4: Grapple points
The grapple is one of the game's important traversal tools and can open up vertical approaches that aren't obvious from ground level.
If you see a usable grapple route near a suspicious building, follow it before assuming the door requires a key.
Clue #5: The building is surrounded by empty space
A structure sitting in an open area with accessible cliffs or rocks around it may be designed to be approached from an unusual angle.
The environment itself can effectively become the key.
Key vs. Route: What Should You Try First?
Here's the simplest way to approach an apparently locked building.
| What you see | What to try |
|---|---|
| Specific key requirement | Find that key |
| Conventional locked door | Search for the associated key |
| No obvious key relationship | Inspect the structure |
| High rock beside building | Climb it |
| Broken roof | Check the roof |
| Broken wall | Search the opening |
| Grapple point | Follow the vertical route |
| Upper platform | Look for an elevated entrance |
| Cave nearby | Investigate the side route |
| Story gate | Continue progression |
This is especially useful because Beast of Reincarnation doesn't treat exploration as purely horizontal. Its environments use vertical movement and multiple traversal mechanics to create alternative routes.
The 5-Second Locked Building Checklist
If you're playing on a controller and don't want to waste time, remember:
- Door — Interact with the obvious entrance.
- Prompt — Does the game actually identify a key requirement?
- Sides — Walk around the structure.
- Roof — Look upward.
- Cliff — Check nearby elevated terrain.
- Grapple — Look for traversal points.
- Key — Only now start searching for the appropriate key.
This simple order can prevent a lot of unnecessary backtracking.
Why Vertical Exploration Matters So Much
The game's exploration systems are built around verticality.
The available movement systems include tools and routes that allow Emma to:
- Reach higher areas
- Cross gaps
- Traverse multi-level environments
- Access isolated platforms
- Find hidden collectibles
The game also doesn't punish falls with conventional fall damage, which encourages experimentation with vertical routes.
That changes how you should approach suspicious structures.
In a more traditional RPG, you might think: Locked door = key.
Here, it is often smarter to think: Locked door = investigate the whole building.
What to Do When You're Returning Later
If you've already moved well beyond the early Ogouchi sections, don't automatically restart your playthrough because you remember a locked building.
Instead:
- Step 1 — Fast travel back — Return to the relevant area.
- Step 2 — Identify the building — Don't rely solely on memory. Use landmarks such as: bridges, villages, camps, rivers, large rock formations, ruined structures.
- Step 3 — Determine the lock type — Ask: Is this a genuine key door or an alternate-entry structure?
- Step 4 — Search vertically — Check roofs, cliffs and elevated routes.
- Step 5 — Use your traversal abilities — Try the movement tools you've unlocked.
- Step 6 — Return with the correct key if necessary — If the game actually presents a colored-key requirement, then the problem is straightforward: obtain the corresponding key and return.
A Better Way to Explore Ogouchi
Instead of clearing the map in a simple left-to-right pattern, use a three-pass approach.
Pass 1: Main progression
Follow the story and unlock the major routes. Don't spend twenty minutes fighting the environment around a building that clearly isn't accessible yet.
Pass 2: Key cleanup
Once you've obtained the major colored keys, revisit previously encountered locked doors. Check: Red Key locations, Blue Key locations, Yellow Key progression areas.
Pass 3: Environmental cleanup
Now revisit buildings and locations that still look suspicious. This time, don't start with the keys. Start with: Roof → Cliff → Side wall → Grapple → Hidden path.
This approach is particularly effective for strongboxes and other optional collectibles.
Strongbox #8: What to Remember
If you're specifically trying to complete Strongbox #8, remember the important sequence:
↓
Find the elevated terrain
↓
Reach the roof
↓
Locate the damaged roof section
↓
Drop inside
↓
Loot Strongbox
↓
3× Ancient Book (Common)
The important part isn't simply knowing where the chest is. It's recognizing why the building looks inaccessible in the first place.
Common Mistakes
Mistake 1: Searching for a key immediately
A locked-looking entrance doesn't automatically mean a colored key.
Fix: inspect the building first.
Mistake 2: Ignoring the roof
Players naturally look at doors because doors are where games usually put locks.
Fix: whenever you see a damaged roof, investigate it.
Mistake 3: Not checking elevation
A building beside a large rock formation is rarely worth ignoring.
Fix: climb nearby terrain and look down onto the roof.
Mistake 4: Confusing progression keys with optional locks
The colored keys can be important to the main progression, but that doesn't mean every inaccessible building is connected to them.
Fix: identify the specific purpose of the door before hunting for an item.
Mistake 5: Assuming a missed collectible is permanently gone
Ogouchi exploration can be revisited later.
Fix: continue the story if necessary, then return with more traversal options and a better understanding of the map.
FAQ
What are the Red, Blue and Yellow Keys used for?
The three colored keys have both optional exploration and broader progression relevance in the Ogouchi/Subcity route. Their most important combined role is opening the sealed progression route deeper into the area.
Does every locked building require a colored key?
No. Some structures are genuine key-locked locations, while others are better approached through environmental routes such as rooftops, cliffs, broken walls or elevated platforms.
What is the easiest way to tell if I need a key?
Check the interaction behavior at the entrance first. If there is a clear key requirement, search for that key. If not, inspect the building and surrounding terrain.
How do I enter the Strongbox #8 building?
Approach it from the surrounding elevated terrain, reach the roof and use the damaged roof opening to get inside.
What does Strongbox #8 contain?
It contains 3× Ancient Book (Common).
Should I look on the roof when a building appears locked?
Absolutely. Rooftops, cliffs and elevated structures are important parts of Beast of Reincarnation's exploration design.
Are Ogouchi collectibles permanently missable?
Current coverage indicates that the zones can be revisited and missed exploration rewards can be collected later, so progressing through the story doesn't necessarily mean you need to restart.
Is the Yellow Key mainly a progression item?
Its major role is tied to the broader colored-key progression through the sealed gate, rather than being a universal solution for every locked-looking structure.
Final Takeaway
The most useful way to think about locked buildings in Beast of Reincarnation is:
Some are. Others are progression gates. And some are environmental puzzles disguised as locked buildings.
The Red Key and Blue Key provide straightforward examples of colored-key access, while the Yellow Key becomes important to the broader progression. But when you encounter an optional building that doesn't immediately make sense, don't automatically start hunting for another key.
Check the sides.
Check the roof.
Check the cliffs.
Check the grapple routes.
Then check your keys.
That mindset is particularly useful for Strongbox #8, where the solution begins above the building rather than at its obvious entrance.
And because Beast of Reincarnation heavily rewards vertical exploration and alternate traversal, learning to read the environment this way can save considerably more time than memorizing another list of key locations.
- Ogouchi Buffer Zone: Missable Strongboxes, Locked Buildings & Hidden Routes
- Parry vs Dodge Guide (2026): When to Block, Roll, and Counter
Xbox Store Page – xbox.com/en-US/games/beast-of-reincarnation – Confirms day-one Game Pass availability and platform details
- Official Language Support - Beast of Reincarnation Steam Page
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