21X
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21X is an algebraic blackjack game in which most cards have an X in their value, with you getting to choose an integer value for X that makes your card total as close to 21 as possible without going over. What's the best hand you can make when your cards are 24/X and 6-4X? Some cards have fixed values, and others contain an N variable that equals the number of cards you have in front of you.

  • Players: 1–6
  • Play time: 15 min
  • Complexity: 1.67 / 5
  • Designer: Leo Samson
  • Year: 2025