Build the four piles at the top-right from Ace up to King, one suit per pile. In the seven columns below, stack cards in descending order, alternating red and black. Only a King (or a stack starting with a King) can go on an empty column.
Controls: tap a card (it gets a yellow outline), then tap the pile where it should go. Tapping a face-down card at the end of a column turns it over. Double-tap a card to send it to the top piles. Tap the deck to deal a card; when it is empty, tap it again to turn the waste back over. The Undo button takes back your last move.