Freecell

Freecell is a solitaire card game, using a standard deck of cards. It is widely known because its software version is usually included with Windows.

Cards are dealt into eight cascades, where every card is visible. There are four foundations and four free cells. The free calls can contain only one card at a time. The top cards of the cascades and the cards in the free calls can be moved. In the cascades you can build down in alternating colors, i.e. put a card on an other one if its rank is smaller by one and their color is different. In the foundations you can build up in suit, starting from the ace. The goal is to move every card in the foundations.