Klondike Solitaire is the patience game everyone knows. Deal seven columns, turn the stock, and move every card to the four foundations in order from ace to king.
Klondike is the solitaire game that shipped with Windows for decades, and the version most people mean when they say patience. It uses one standard 52-card deck. Cards start in seven columns, each one deeper than the last, with only the top card of each column face up. The rest wait in the stock.
Every card you move goes to one of three places: another column (built down, alternating red and black), a foundation (built up, one suit per pile, starting with the ace), or the waste pile after you turn it from the stock. Almost every decision in the game is a choice about which of those three is worth doing first.
Unlike most solitaire variants, Klondike is not always winnable from the deal — a reasonable estimate is that around four in five deals can be finished with careful play, and the rest cannot. That is what makes it interesting: you are not just following rules, you are spotting which of the available moves keeps the most options open.
The game comes in two flavours. With draw one you turn a single card at a time and the game is forgiving. With draw three you turn three at once and can only play the top one, which is markedly harder. Both are available here from the same deck.
Not every deal, no — that is true of Klondike in general, not just this version. Roughly four deals in five can be finished with careful play. Undo lets you retry a line you regret.
It repeatedly sends the top card of every column and the waste to the foundations whenever it legally can. It is a time-saver for the last few cards, not a solver — it will not dig you out of a stuck position.
The game does not persist a half-finished board. Each new deal starts fresh, and undo history lasts for the current session only.