Trefoil Solitaire is a free solitaire card game for the PC. In the game, the four aces are placed in the foundations, and the remaining 48 cards are dealt into 16 piles of 3 cards each. The top card in each pile may be used to build the piles down by suit, or build the foundations up by suit. When a pile disappears, it may not be filled, it is gone. The cards not in the foundation may be shuffled and redealt up to 3 times.