A game is an activity that provides entertainment or amusement. A game can be played solo or with a large group of people. Games can be played with or without structured rules depending on the game. Games generally challenge the mental and physical prowess of the person who is gaming.
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Thirty-Six Card Trick is a classic pair-matching game.
Flip over the cards to find matching pairs, but make too many mistakes or run out of time and you're a goner.