Twenty One

How about a game of cards?
Ever heard of or played twenty-one?
Twenty-one is a famous card game where you must go measuring and buying cards who get closer to 21 wins, however, if you pass 21, you lost!
Maybe you have a natural gift with cards, or maybe it's pure luck, but you can not deny that the harder you will be to do exactly 21!
Test your skills and your luck, and whoever gets closer to 21 wins!