Blackjack for math lovers

In 21X you win just like Blackjack - by getting to 21...

...unlike Blackjack, every card is a different formula with an X value you decide. Get the right value of X to make your cards add up to 21 and you win. Algebra has never been so fun... we're serious! 


  • Can be learned in less than 1 minute, plays in 5 minutes
  • Compact - take it anywhere
  • Adjustable difficulty for any group with easy, medium and hard cards


  • A stocking-filler gift for a mathy friend or family member
  • Puzzle lovers looking to stretch their brains
  • Homeschoolers and teachers looking to make algebra fun

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