Spoiler-light hints

You cannot reliably finish this immediately. Complete five other puzzles first. Look for a tool that turns two four-digit numbers into a location, then search east and south of the starter hub.

  • Hint 1: finish the red tower prerequisite
  • Hint 2: use either the map or GPS
  • Hint 3: the target button is camouflaged behind a rock

Complete solution

Open the portable map and follow longitude 41 and latitude 18 to their shared grid square. The 66 and 99 refine the point toward the lower-right portion of that square. One player must stay on the hidden button while a second returns to the numbered structure and takes the exposed reward, so carry walkie-talkies if your group has them.

Frequently asked questions

What do 4166 and 1899 mean in Big Walk?

They are coordinates that identify the remote button controlling the reward case.

Can you solve 4166/1899 before unlocking the map?

A GPS can also lead you there, but the established route expects later progression rather than an immediate early-game solve.