Shamrock Solitaire is a pile based solitaire card game. Like in most solitiare card games, your goal is to build up four suit piles from Ace to King by suit. The rules for building on the piles are really loose with one exception. You can't have more than 3 cards on any given pile. If there are less then 3 cards on a pile, you can place a card that is one more than or one less than the card currently on the top of the pile, and you can ignore suit. With most pile based games, you can't start a new pile in the place of a pile where all the cards were removed.