A solitaire card game. The goal is to send all cards into the black hole. The black hole is in the centre, and at the start it holds the Ace of Spades (A♠). The rest of the deck is dealt around it in groups of three. A card can be sent into the black hole if it is not covered by other cards and its rank is one higher or lower than the card currently in the centre. The card order is 2, 3, 4, 5, 6, 7, 8, 9, 10, J, Q, K, A, 2, 3, ... So an Ace can be followed by either a 2 or a King.