The numbers 4166, 1899 in Big Walk are coordinates for a distant button. One teammate must hold that button while another stays at the original reward case and takes the item when it opens. You are not entering the numbers into the case itself. [pcg-coordinates]

Bring a way to read coordinates

Unlock the Map Room through the Red Tower and take the folding paper map. The large floor model is useful for island planning, but the portable map has the numbered grid you need here. A coordinate display found near the Green Tower is another way to locate the button. [gs-coordinates] [pcg-coordinates]

Read the target square

On the paper map, find the intersection of the 41 and 18 grid lines. PC Gamer describes the remaining digits as a more precise position within that square: approximately two-thirds of the way south and almost at its eastern edge.

Search the rock faces in that area. The small button is camouflaged against the terrain. GameSpot’s landmark description places it in the south-central area between a railway bend and the chairlift’s tunnel approach. [pcg-coordinates] [gs-coordinates]

Split the roles

  1. Leave one player at the case where you found the number sign.
  2. Send the searcher to the mapped location with a way to stay in contact.
  3. Find and hold the button on the rocks.
  4. Have the waiting player take the reward while the case is open.
  5. Confirm the item is out before the searcher lets go. [gs-coordinates]

If the whole team walks to the button, nobody is left to collect the reward. If the case opens and closes before the item is taken, coordinate another attempt with the button held throughout retrieval.

Using the coordinate display instead

A carrier can hold the display for a teammate to read, or attach it to a backpack. Watch whether each number moves toward or away from 4166 and 1899 as you walk. This helps refine the search after the paper map gets you to the right area. It still does not remove the need for a player at the case. [pcg-coordinates]