I chose game C, although on closer reading of the question I believe this still falls under your definition of game B.

It's the game where the rules are fixed, and everybody must play by them, but there is no requirement for the players to learn the rules or to even understand that a game is being played.

I was thinking of Bitcoin, where it's likely that most people in the future will not know that their money is run on a distributed ledger, they won't know anything about how it work (as they don't know anything about how fiat works), but nonetheless they will abide by the rules.