How do you unlock the map room?
Solve five available puzzles, carry their reward objects to the red tower, and place them on its roof. PC Gamer reports that the map room opens near the starting hub once this step is complete.
How do coordinates work?
The portable map shows numbered grid lines. For 4166 and 1899, use 41 and 18 to choose the grid square; the final two digits indicate a finer position within that square. Community-tested route descriptions should be treated as field notes rather than official labels.
Frequently asked questions
Where is the Big Walk map?
It becomes available in the map room beside the starting hub after five rewards are placed at the red tower.
Do you need the map for 4166 and 1899?
The map is one option. PC Gamer also documents a GPS device near the green tower as an alternative.