This is right up my alley! I built a mystery game where each player got a custom ID card that linked to hidden web puzzles. I used a starter template from
https://fakeidtemplates.org/driver-license-maker/ then embedded QR codes in the signature strip that directed players to encrypted files. I also hid narrative clues in microtext under the photo area—only visible when magnified. By color‑coding border accents for different story branches, players could self‑select paths. The physical card felt tangible, and the digital integration kept the game dynamic. Balancing legibility and secret messages was tricky, but iterating with focus groups helped refine the concept.