Press either hit or stand each turn. Hit makes you pick up a card from 1-K with 10, J, Q and K being 10 points. Stand means you don't pick up a card and you can't for the rest of the game. Next it is the enemy's turn, they can also hit or stand but you can't see their cards. If both you and your enemy stand, the person with more points wins. If either of your point totals goes over 21 they lose.
Inspired by my card game Bradjack which is inspired by Blackjack. Ace only ever equals one, never 11. Only took 2 hours to make.