I picked up a batch of NFC tag stickers from you know where.
I started thinking they would be a fun way to host a hunt-type game during a conference, gathering, or other event where the playing field could be large enough and diverse enough, yet still somewhat controlled.
They look innocuous enough, just a plain white circle about 1″ in diameter.
You could direct someone to a landmark — a sign on a building or street, a shelf in a bookstore, a corner of a bar, etc., where you have pre-planted a preprogrammed tag, have them locate and scan the tag, on which they’ll find clues — a URL, a phone#, an email address, or just a block of text. The options are endless.
I think most modern phones support the NFC apps. On my Pixel 6, I’m using NFC Tools by WakDev. Here’s what it looks like on an empty tag:
You can see from this screenshot that it’s writable, can hold 540 bytes of data, and can be made read-only. This is useful to have this choice. In a hunt game, you may want to make the tag read-only so that players can’t corrupt your clue data. If you’re using these tags to exchange data with someone, however, you may want to leave it writable. Imaging using it as a stealth message delivery tool.
Here is the large list of types of data it supports. You’re limited by its 540-byte memory, but anything too large to fit on here can be put somewhere semi-privately on the web and just shared as a URL.