r/Constructedadventures • u/Buccinators • 2h ago
RECAP Halloween treasure hunt
I make a yearly halloween treasure hunt for my kids and their friends. It's a tradition going back 7 years now, starting when my kids were 3 and 4. It's been great fun to think out ways to challenge them throughout the years and build more and more advanced puzzles and activities. This year I stumbled upon Constructedadventures and felt like sharing. And yes, I know halloween is a week away, but for various reasons this years treasure hunt came a bit early.
This years participants were 4 kids aged 9-12. Below I'll outline the whole thing from beginning to end.
The starting point
As tradition dictates, the goal of the treasure hunt is to open a locked chest containing treats. We began at dusk because looking for clues with flash-lights are much more fun and in keeping with the halloween spirit than doing it in broad daylight. I placed an envelope on the treasure chest containing a word search puzzle. Every word revealed the hiding place of a few jigsaw puzzle pieces in the house and in the surrounding area.
There were 24 words in total, netting 64 puzzle pieces. Finding all of them took about 40 minutes. When needed I aided them with clues, but I generally try to only intervene when the kids are completely stuck since it's more fun for them to figure things out on their own (and for me to hear all the wild ideas along the way).

Building the puzzle
This was a little harder than I had anticipated due to me choosing a motif without very many clear features and just a few colours. In retrospect I should have picked a cleaner motif and provided a print-out as a reference, but they managed to put it together with some help.
The puzzle itself was 3d printed from an AI-generated image (just layered by colour with a negative form separating the pieces).
The finished puzzle depicts a map and 3 seals which represented challenges that needed to be completed in order to make sense of the symbols and letters on the back of the puzzle pieces (see image below).


Challange 1 - Follow the string, find the key.
I took a long piece of string and ran it from an open window on the second floor, down through another small building and around the yard with some detours. Whenever possible I hid it with leaves and such so that they'd have to follow the string from beginning to end. At the end I tied the string to a locked cryptex gadget that I had buried in some gravel (inside a plastic bag).
The kids quickly followed the string and almost immediately figured out that the cryptex contained an object (by shaking it) and correctly guessed it was the key to the chest. They also deduced that they were now looking for 6 letters in order to open the cryptex.
As a side note I can very much recommend this kind of cryptex in various adventures. I tend to re-use it a lot.

Challenge 2 - Choose your poison
For the second challenge I used 3 vials. One with cordial and 2 with water and a pinch of salt. I used some food colouring to make it look more interesting and wrote a note saying "if it's good it's right". I also labelled the vials with various number sequences. The numbers on the cordial was the actual clue, the other ones were decoys.
One of the kids sniffed the vials and figured out that the middle one was the right one, but for some reason they also decided to taste them anyway (which was fun and I finally got back at my son for pouring salt in my coffee an early morning in the past).
They had no issues completing this one, and brought the right vial with them (and drank most of it).

Challange 3 - Hand in the jar
I had 3 containers, first one filled with oobleck, second one with green slime and the third one filled with cold pasta, vegetable oil and some fake blood. In one of them I dropped a small container that held the final clue. Over the containers I mounted a plywood sheet with holes big enough to put your hand through so that each hole was directly above a container. I then put a black paper table-runner over it and cut out an X over the holes.
The kids had to put their hands in the mystery guck and feel around for a clue. They had great fun doing this and it got a little messy but that's ok. They quickly fished out the container and got the final clue.

Solving the final puzzle
So now the kids had the Cryptex, 6 number sequences on two notes (2-7:1, 5-3:5 and so on) and the backside of the puzzle. The solution here was to treat the numbers on the clues as coordinates on the puzzle board. So 2-7:1 would be the 7th row, 1st column (resulting in the letter K). the 2 (2-7:1) meant the 2nd letter on the Cryptex (6 letter combination). A clue in figuring this out was on the backside of the puzzle where a few pieces were marked with their actual coordinates.
This took some work to figure out and there was a lot of theories, but with some additional clues (I answered yes/no questions for a bit then told them they were on the right track when one of them said "perhaps its coordinates") they managed.
The most fun part to me was that all of them got to figure out a piece of the riddle. One came up with the coordinates, another one figured out the relation to the coordinates given on the puzzle board, a third one deduced that the first number was 1-6 which was how many letters they needed and so on.
With the Cryptex unlocked the kids got the key to the chest and their well earned reward.
To conclude I hope whoever read all of this got something out of it, perhaps some inspiration or an idea for your own treasure hunt. If you have any questions, feedback or thoughts I'd be happy to hear it/answer them.









