Narwhals are the trump suit in Moby Trick, but not always because the orcas, sperm whales, and blue whales can also turn the tide.
All the familiar rules of trick-taking games apply, but there is a special twist: Whoever wins the trick chooses a card that has been played and scores it, but whoever played this card receives bonus effects for one of the next rounds. For example, they can change the trump suit or influence the round in other ways.
