Fleissner Grille Cipher?
Steg punisher img as the card? (suggested by anon from earlier breads)
"Grille" is a kind of transposition cypher: a cardboard piece with holes in such a way, that when laid over a grid and rotated around, every cell is shown only once.
https://www.instructables.com/id/Fleissner-Grille-Cipher/