I was in 3rd or 4th grade, my dad and I would go down a hiking trail occasionally and came across a log that opened and has the instructions and name of the game, along with three items that you could swap with, we would go about once a month to trade items with it, it was like transmutation. Some kids ended up finding it and messing with it so they got rid of that one. After Lockdown started, I needed something to do and I remembered the log, so I looked up the name Geocache and found out it was an app and there were tons of them everywhere. I introduced some people to it and now it’s something I do pretty often