Big Walk 4166 1899: where the hidden button is, and two ways to find it

You probably found this too early

Most groups walk into this one shortly after the tutorial puzzles, and at that point it is genuinely unsolvable. That is by design rather than a hint you are missing something in the room.

The sealed box sits near the beach with the reward behind frosted glass, and a sign hangs on a hook above it with two four-digit numbers. There is no keypad, no dial and nothing in the structure to interact with. The numbers are not the puzzle — they are an address, and you do not yet own anything that can read addresses.

If you have just arrived, the useful move is to leave and come back. Five more puzzles and the Red Tower stand between you and the tool you need.

What 4166 and 1899 actually mean

They are a coordinate pair for the island grid, and each four-digit number does two jobs at once. The first two digits name a grid line; the last two say how far along that section to go.

• 41 and 18 name the two grid lines. Where they cross is the square to search — south and east of the starting hub.
• 66 means roughly two thirds of the way south from the top of that square.
• 99 means almost hard against the far eastern edge, right along the gridline.
• So the target is not the middle of the square. It is the bottom-right corner of it, which is where most groups stop searching too early.

Route one: the paper map

Place five rewards on the Red Tower roof. The map room opens next to the starting hub, holding the large floor map and — the part that matters — a foldable paper map and compass you can carry.

With the map open in your hands, trace the two grid lines to their intersection and walk there. The map does not mark the button, so expect to sweep the rock faces rather than spot it from the path. It is deliberately camouflaged and easy to walk straight past.

Route two: the GPS, which most guides skip

There is a second tool that solves this without any map reading at all, and it is the more enjoyable route. Outside the Green Tower, a red frame holds a GPS device that displays its own current coordinates on a screen.

Take it, and the puzzle turns from estimation into navigation. You can hold it up so a friend can read it, or stick it on someone’s backpack so a second player can call directions while watching the numbers move.

Walk until the readout matches 4166 1899. The numbers climbing or falling tells you whether you are getting warmer, which is a far more forgiving way to find a camouflaged button than pacing out a grid square.

• The GPS lives in the same part of the island as the button, so fetching it is not a detour.
• On a backpack it faces the player behind, so the navigator reads and the walker walks.
• Near the target the readout gets twitchy. Take short steps rather than long ones or you will overshoot repeatedly.

The part that needs two people

The button has to be held down, and the box it opens is back at the beach, far out of sight. That separation is the actual puzzle — everything before it is navigation.

One player stays on the button and holds it. The other has to already be standing at the sealed box, because the glass opens while the button is held and the reward needs collecting straight away.

Take walkie-talkies. The person on the button cannot see the box and the person at the box cannot see whether the button is held, so say what you are doing rather than asking whether it worked.