Shamrocks Solitaire, a solitaire card game where all the cards are dealt into piles of 3. The player can build the piles up or down, without regard to suit using the top card in any other piles. There are a few rules that make Shamrocks Solitaire a trick game. The first is that no pile is ever allowed to have more than three cards in it at a time. The second is that when all the cards have been removed from a pile, the pile is gone for good and can not be started again with another card.