Group cards on the tableau down in suit from King to Ace. Groups of cards, regardless of sequence, can be moved if the top card of the group is 1 lower in value than the card you are moving the group to.
Remove all cards and reveal the three towers. You can remove cards from the game by clicking on cards that are 1 higher or 1 lower in value than the open card at the bottom. Click on the closed stack to get a new open card.