The object this game is to move the cards to the pile in the middle (the black hole).
You can move any top card from another pile to the black hole provided that the card is either one above or one below the value of the card on top of the black hole. In addition, Aces can be placed on Kings and Kings can be placed on Aces.
If you manage to move all the cards to the black hole without getting stuck, then you have successfully completed the game.