Back with my family growing up, we sometimes played Uno with Cheating.
Basically this meant you were allowed to cheat in any which way (playing on somebody else’s turn, playing mismatching cards, playing several cards at once, drawing too few cards, hiding cards somewhere…). BUT if you were caught before the next player made their move, you had to undo the cheating (e.g. take back the cards), draw an extra card, and you forfeited your turn.
This sometimes led to extreme fun, particularly late at night when everybody was tired and cheating was more likely to go unnoticed.








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