Ein (A Copyright-Infringement Free Uno Clone)
Literally just multiplayer
Uno Ein in the terminal. 2-10 players, same rules as the popular game Uno. You can't really call Uno Ein on other people because it wouldn't work. Currently works best as local multiplayer, though I suspect if you did it in a multiplayer session and made sure people didn't look at terminal during other people's turns it would be fine.