Invisible ink memory
Also searched as: Invisible Ink / Color Tile
The short answer
The blue building holds 9 tiles whose symbols are only visible through the lens provided. The door locks behind you, so you have to inspect every one before you move anything. Build a memory system out of the statues, rocks and other visual markers outside, then place the tiles on the five-symbol panel. The panel changes when it is re-armed, so never reuse the previous sequence.
- Players
- 2 players
- Time
- 20-30 minutes
- Coordinates
- 3740, 2140
- Reward
- 1 green tower part (gourd)
Find 3740, 2140 in the coordinate finder
What it actually tests is whether you looked at everything before the door locked. Plenty of people run out holding tiles and then discover they memorised nothing.
Before you start
- 2 players: one holds the tile up, one reads through the lens
Step-by-step 4 steps
- 1
Walk in without triggering it
The blue building contains 9 tiles. Note that the door locks once you start, so inspect every single tile before you trigger anything.
- 2
Read the symbols through the lens
The symbols on the tiles are normally invisible - you can only see them through the lens provided. One player holds a tile up, the other reads it through the lens and remembers it.
- 3
Anchor the memory to the landmarks outside
Outside the door there are obvious visual markers - a statue, rocks. Bind each marker to a tile symbol; that is far more reliable than memorising the symbols directly.
- 4
Place them on the five-symbol panel
On the five-symbol panel outside, place the tiles according to the pairings you memorised.
Faster: The panel changes when it re-arms. If you fail and retry, do not assume last round's sequence still means anything.
Where it goes wrong
These are the places players actually get stuck most often. Working through them in order usually finds the cause.
Other Green tower puzzles
After finishing: 1 green tower part.
Where this solution came from
bigwalk.tips gives 3740, 2140 and the full mechanic - 9 tiles, symbols only visible through the lens, the door locks, the panel changes. The GameSlayer's Invisible Ink and games.gg's Color Tile describe the same mechanic.
Puzzles in this game are not assigned in a fixed order: each tower needs a set number of gourds and has more challenges around it than that, so you choose which ones to clear, in any order. That is why two guides list different puzzle line-ups for the same tower — neither is wrong. Unless a coordinate is credited to a named source it is a community measurement, and later versions can shift it; once you are in the area, trust the landmark over the number.