Direct answer
Big Walk 4166 refers to the 4166, 1899 coordinate puzzle near the red tower route. The numbers are not a code to type into a menu; they are map coordinates that point your group toward a remote button on the island.
To solve it, first unlock the map by completing the red tower route. Then use the map to locate 4166 on one axis and 1899 on the other, travel to that area, and have one player hold the button while another player takes the red gourd from the box.
What the 4166, 1899 numbers mean
The collected source material identifies 4166 and 1899 as coordinates, not a redeem code or password. Polygon describes the puzzle as a box with items inside and a sign showing the numbers 4166 and 1899 nearby.
The same source material says the solution sends players across the map rather than asking them to solve everything in the immediate area. This is why the map is strongly recommended before attempting the puzzle.
Get the map first
The map is unlocked through the red tower progression. The source material says you bring five red gourd-shaped collectibles to the red tower, receive a key, shave or cut the key by following arrows, and eventually reach the map room.
Inside that room, players can find the large island map and a portable map. The portable map is especially useful for a two-player group, because one player can carry it while the other handles the puzzle object.
How to read the coordinates
The source material describes 4166, 1899 as map coordinates, with the map used to match one number to the horizontal direction and the other to the vertical direction. If your group is not used to coordinate systems, the important rule is simple: do not treat the numbers as a locker combination.
Use the portable map to narrow the search area, then move toward the matching region. If the exact axis behavior feels unclear in your session, mark it as 待确认 for your group and use nearby landmarks to correct your route.
Where to look on the island
The source material places the button around the coordinate point rather than directly beside the reward box. Polygon says the button is on a conjoined rock on a hill, south of a puzzle inside a green ring with many monitors.
That means your group should not all stand beside the box. Send at least one player to the coordinate location, while another stays ready near the box so the reward can be taken as soon as the button opens it.
What each player should do
One player should travel to 4166, 1899 and hold the button. The source material is clear that the box remains open only while the button is being pressed, so tapping it once is not enough.
Another player should wait at the box and grab the red gourd when it opens. If you have walkie-talkies, use them to confirm when the button is held and when the reward has been recovered.
Best tools for the puzzle
The map is the main required tool. The source material also mentions a GPS as optional, located southeast of the green tower, but the map remains the priority if your group has only two players.
Walkie-talkies make the process easier because the button holder and box player may be far apart. Without them, your group needs a signal plan before separating.
Two-player strategy
With two players, keep the plan simple. One player carries the map and travels to the coordinate area, while the other waits near the box.
If the travelling player also has a walkie-talkie, they can call out when they have reached the rock and are holding the button. The waiting player should not leave the box during this step, because the opening window depends on the button being held.
Common mistakes
The first mistake is treating Big Walk 4166 like a redeem code. It is not a code page, and no official redeem-code use was confirmed in the source material.
The second mistake is bringing the whole group to the box. The puzzle is designed around distance, coordination, and communication, so splitting roles is the cleanest approach.
What is still 待确认
The source material confirms the coordinate concept, the need for the map, the remote button, and the red gourd reward. Exact route preferences, easiest approach direction, and whether your session has already unlocked every needed travel shortcut are 待确认 because they depend on your group progress.