Direct answer
The Big Walk map is unlocked after completing the red tower route. The source material says you bring five red gourd-shaped collectibles to the red tower, receive a key, shape that key through cutters, and follow the route to a large blue doorway with red stairs.
Inside the map room, you find the big island map and a portable map. The portable map can be carried through the world and is one of the most useful tools for navigation and coordinate puzzles.
Why the map matters
The source material describes Big Walk's island as large, easy to get lost in, and full of challenges, items, towers, and sights. Without a map, players mostly navigate by memory, visible landmarks, and group callouts.
With the map, your group can plan routes instead of wandering. It is especially important once puzzles begin sending players to distant places or asking for coordinates.
Start with the red tower
Polygon says the map requires red tower progress first. Bring five red gourd-shaped challenge rewards to the red tower to receive the key.
After that, the key must be shaped or shaved by following the indicated cutters. The source material from both Google and YouTube points to the same idea: the map is behind red tower progression, not available at the very start.
Entering the map room
After the red key route, the source material says players reach a large blue doorway with red stairs. Inside is the map room, which contains a large physical map of the island.
This room is not just a menu screen. The map exists as an in-world object and place, which fits Big Walk's design of making information physical and shared between players.
What is inside the room
The source material says the map room includes a big map, three laser pointers, a compass, and a normal-sized map that players can carry. The big map gives a broad view of the island, while the portable map is the tool you take with you.
The YouTube source also describes the map as a physical place where players can see completed areas, flags, radio stations, backpacks, and nearby routes. If a detail differs between sources or game version, mark it 待确认 in your live guide.
How the portable map works
The portable map does not behave like a modern GPS in the source material. Polygon says it shows landmarks and towers, but unfortunately does not show your exact player position.
That means the player carrying it still needs to compare visible surroundings with the map. Use hills, towers, colored regions, stations, and coastline shapes to decide where you are.
Carrying the map safely
The small map can be carried in a backpack or side satchel. That matters because Big Walk has limited hands, and important items can be dropped if a player falls far enough.
If your group has only one map, assign a map carrier. Do not let every player assume someone else has it, especially before starting a route to coordinates.
Using the map for coordinates
The map becomes essential for coordinate puzzles like Big Walk 4166. The source material says the 4166, 1899 puzzle relies on reading map coordinates and sending a player to the correct place.
For these puzzles, one player should read the map while another handles the reward or button. Walkie-talkies make this easier when players are separated.
Planning routes with friends
Use the map before leaving a safe area. Decide the next tower, route, and backup regroup point before the group starts moving.
If the team splits, stop and describe visible landmarks instead of continuing deeper into the island. The map is strongest when combined with consistent group language.
What is still 待确认
The source material confirms the red tower requirement, map room, portable map, compass, and usefulness for coordinates. Exact marker behavior, completed-puzzle visibility, and whether every map-room object appears the same across versions are 待确认 where sources differ.