Ethereum cryptocurrency games are like this. The cryptocats led to STUFF that led to the great Ethereum heist of 50 million dollars. Later, the cryptocats migrated to a token (a subset of ethereum smart contracts, kinda like a reserved subset of ether's computational power all to yourself) that came to host a pokemon minigame. In this pokemon minigame, entry costs close to $80 and you'll sooner lose everything for the dumbest outside circumstances. It's like a scam. They even ask for an email to login (ether is supposed to be anonymous). There is also an inane NBA crypto game.