Doubled Card Solitaire

Build the eight foundation piles by suit from Ace up to King using cards from two decks. Arrange cards on the tableau in descending order while alternating colors to unlock hidden cards. Move whole runs when possible to open spaces and create longer sequences. Fill empty tableau spaces with a King or a valid sequence starting with a King to maintain mobility. Draw from the stock to the waste when stuck, and recycle the deck if the ruleset allows. Use hints and undo to refine strategy, then clear all cards to win the round.