You build a deck of cards (minimum of 30) using all suits, numbers and face cards.
You can use a single deck type as well as multiple cards from different decks (you can use a card from The Tops and a card from another casino if you want... card are found everywhere and some can be bought through merchants).
From there, you play on three piles (or Caravans) as well as your opponent's if you so choose.
The goal is to get each of your piles to add up to a total number that is more than 21 but less than 26.
Meanwhile, you use face cards to determine whether any (or ALL in some cases) pile loses certain suits (clubs, spades, hearts, diamonds), particular cards or goes in a certain direction.
At the end, you want to reach the afformentioned point total before your opponent by 'selling your caravans.'