After beating the normal ending, go from the tutorial/map area to the open green building beside the train station and turn in the remaining 15 collectibles, including the seven purple post-game ones, to reach the 100% ending path.
The 100% ending route in Big Walk opens after the normal ending, when the post-game map adds the last batch of purple puzzles and pushes you toward a final turn-in. The building you want is not hidden deep inside a tower: it is the big green building near the tutorial/map side of the world, beside one of the main train stations.
Green building near the train station
KEY!
Once the normal ending is done, the green building beside the train station becomes the important post-game location. It is used for the final 15 collectibles, including the seven purple post-game ones that appear after credits.
The route is spoiler-light: you only need to know where to go and what to bring. The building is close to the tutorial/map area, near the station with the red train visible on the map, and it is the large green structure next to the station.
How to find the secret ending building in Big Walk
Start from the tutorial room and head back toward the train station side of the map until the green building comes into view.
STEP 1/7
Start in the tutorial room
Face out from the tutorial room, using it as your reference point for the post-game route.
STEP 2/7
Leave the main area
Go out through the main opening and head toward the train station side of the map.
STEP 3/7
Aim for the opened door
Move toward the door by the station; if the shortcut is shut, loop around and press the nearby button to open it.
STEP 4/7
Look for the green building
The target is the big green building sitting beside one of the train stations.
STEP 5/7
Turn in the last collectibles
Place the remaining 15 collectibles here, including the seven purple post-game ones.
STEP 6/7
Check the map position
On the map, the location is by the station where the red train comes up.
STEP 7/7
Use the large green structure
The main building for this route is the large green one next to that station.
Video help
Requirements before the final turn-in
| Requirement | What |
|---|---|
| Normal ending | Finish the main ending before chasing the final turn-in. |
| Seven purple puzzles | Clear the post-game purple puzzles that appear after credits. |
| Remaining collectibles | Clean up skipped content so you have the final 15 collectibles. |
| Final building turn-in | Bring those collectibles to the green building beside the train station. |
The green building only matters once you have already cleared the normal ending path. After credits, seven purple puzzles appear around the world, and those are part of the last push toward the 100% ending route.
One point is worth keeping tidy: the exact Big Game or true-ending trigger is described in two ways by early players. The green-building route is the turn-in path for the final 15 collectibles, while other descriptions mention a final key and a secret room near spawn, so check both late-game leads if you are sitting at 100% with no ending trigger.
Use the train station as your landmark: from the tutorial/map side, look for the open green building next to the station instead of searching inside the Sphere area.
Four Gourds are a separate early objective
Do not mix the final post-game collectibles with the four Gourds. The Gourds belong to an earlier progression chain for the Red Bridge/Drawbridge key, where players place all four in the central mechanism and use the unfinished key at nearby altars before opening the bridge path.
The last early Gourd is often the one that causes confusion because it is tied to a green coastal puzzle space. Players describe it around a large green structure overlooking the ocean, with synchronized floor switches, and also as a sealed box interaction involving a telescope near rocks. That is a separate route from the 100% ending building, even if the green-building language sounds similar.
100% ending route not opening
| Problem | Fix |
|---|---|
| Normal ending is unfinished | Clear the normal ending before expecting post-game purple puzzles or the final turn-in path. |
| Side puzzles were skipped | Return to unfinished puzzle areas and push the save toward full completion. |
| Purple puzzles were ignored | Find and finish the seven purple post-game puzzles after credits. |
| Wrong location | Go to the big green building beside the train station near the tutorial/map side. |
| Gourds mixed up with late-game collectibles | Treat Gourds as early Red Bridge/Drawbridge progression, not the final 15 collectible turn-in. |
If the building is visible but inaccessible, use the nearby door shortcut and button route around the station area. If you have already done the green-building turn-in and still need the final sequence, check the spawn-side secret-room lead tied to the late-game key.
Related Big Walk guides
Frequently Asked Questions
Does this spoil the secret ending itself?
No. This guide only points you to the post-game building and the turn-in route; it does not describe what happens in the secret ending sequence.
Are the four early Gourds the same as the final 15 ending collectibles?
No. Gourds are for early bridge progression, while the final 15 collectibles are part of the post-normal-ending route tied to the green building and 100% completion.
Do the latest voice-volume patches change the ending route?
No gameplay-route change is indicated. The current post-launch notes around version 1.4.8 address quiet proximity voice volume, not puzzle layout, ending access, or tower progression.
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