What 4166, 1899 Actually Means
On a beach you'll find a frosted-glass container holding a red gourd (nubbin), with a small sign hung above it showing two numbers: 4166 and 1899. The numbers are map coordinates, not a password — you don't type them into the box. They point to a hidden button somewhere on the island; holding that button is what opens the container so a teammate can grab the reward inside.
Verified across PCGamer, GameRant, Polygon and Sportskeeda: 4166 is the longitude (X) and 1899 is the latitude (Y). Read on for the two reliable ways to turn those numbers into a location.
Prerequisite: Red Tower → Map Room
You can't solve this straight out of the tutorial — that's expected, not a bug. First clear the Red Tower (the recommended first tower), grab its key, and unlock the Map Room. That's where you pick up the folding paper map and compass, which the coordinate method depends on. Until then the numbers are just tantalising decoration.
Method 1: The Map Coordinates
Open the map from the Map Room. Treat 4166 as a longitude line near 41 (the 66 is a finer offset toward the map's centre), and 1899 as a latitude line near 18 (the 99 is a finer offset). The intersection lands in the south of the map.
On the ground, use the blue railroad structure (by the destroyed/broken train) as your baseline — it sits roughly on line 41. From there, head south until you reach a cluster of rocks, then go behind them. The button is tucked against the rock face, between the railway bend and the cable-car tunnel, south-east of the starter hub. The video walkthrough above shows the exact rock-to-button path.
Method 2: The GPS Device
If coordinates on paper aren't your style, there's a shortcut near the Green Tower: a red frame by the cable-car station holds a GPS device that shows your live coordinates on screen. Pick it up, carry it on a teammate's back, and simply walk to the target coordinates — no map-reading required. This is much easier once you've unlocked the train, since the island's south is a long hike otherwise.
Co-op: Two Players, One Button
This is a two-player minimum puzzle. One player stands at the button and holds it down — the starter container only opens while the button is held. The other player runs back to the box to collect the red gourd. Because the button and the box are far apart, keep your walkie-talkies handy and talk each other in.
Common Mistakes
- Typing 4166 / 1899 into the box as if it were a code — it isn't. The numbers are a location.
- Trying before clearing the Red Tower. The map (and thus the method) isn't available yet.
- Stopping at the rocks instead of going behind them — the button is on the far face.
- Forgetting it needs two people: one holds, one grabs. Solo you'll just stand there.
The coordinate reading (4166 = X, 1899 = Y; button south of the hub near the destroyed train) and the two-player hold-and-grab mechanic are consistent across PCGamer, GameRant, Polygon and Sportskeeda. Exact grid offsets (66 / 99) are community refinement — use the railroad structure as your on-island baseline if the map feels imprecise.