Solitaire has several variations, each with their own rules. The most common form, Klondike solitaire, involves placing all cards from the starting configuration into four stacks, one for each suit. There are seven stacks of cards, known as the tableau, where the primary action of the game occurs.
From left to right, the stacks in the tableau have an increasing number of cards. Only the top card is face-up. To move a card or series of cards from one stack to the other, the cards have to be the number immediately lower and an alternate color. For example, a red 6 can only be placed on a black 7. When the face-up cards are moved, the top card on a stack is turned face-up and made available for play. If a stack is empty, a new stack can be started with a king. Aces are placed in the four foundation stacks, which are built up by consecutive cards in their respective suits.
Cards from the stock, or what was not used in the tableau, can be drawn and placed there. Some versions of the game allow a stack of three waste cards that must be used before replenishing the waste stock. The game is over when all the cards have been moved to the foundation stacks.