SET is a card game centered around patterns and pattern recognition. An important part of the game is that SETs come in threes. One of SET’s endgame scenarios involves being left with six cards containing no SETs at the end of the game. But, what if you were missing a card from your deck and you were left with only 5 cards at the end of the game? With 81 cards in the full deck and 1080 possible SETs, how will you ever figure out which card you are missing? In my MAT 380 talk on April 24, we will solve this End Game problem using some simple linear algebra and modular arithmetic. I hope to see all of you there!