Klondike

Klondike is the patience everyone knows: seven columns, four foundations and a stock. Click a card and then where it should go — a run of face-up cards moves together, a column takes a card one lower in the opposite colour, an empty column takes a king and a foundation takes the same suit ascending from the ace. Cards can be taken back off a foundation, and when a move is refused the game says why. Free, no sign-up, plays right in the browser.