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As with many other trick-taking card games, the idea of The Bottle Imp is to acquire the most points. The Bottle Imp makes trumps out of the lowest cards. The player with the highest card less than the price of the Bottle earns the trick and also the bottle imp card. Then the price of the Bottle falls to that of the winning card.
In this way the owner of the Bottle Imp changes until its value can no longer be undercut. Whoever has the Bottle Imp at the end of the hand earns negative points instead of positive ones.