1Klondike Solitaire has been included in every version of Microsoft Windows since Windows 3.0 in 1990, making it the most widely distributed card game in computing history.
2Approximately 79% of all Klondike Solitaire deals are mathematically solvable when played with perfect strategy, according to computer analysis of millions of random deals.
3Klondike Solitaire is the most-played single-player card game in the world, with an estimated 35 million players in the United States alone.
4The name 'Klondike' comes from the Klondike region of Canada's Yukon Territory, where prospectors played the game during the 1896 Gold Rush.
5A standard Klondike Solitaire game uses one 52-card deck and deals 28 cards into 7 tableau columns, leaving 24 cards in the stock pile.
6In Draw-3 Klondike Solitaire, the win rate drops to roughly 10-15% compared to 30-40% in the easier Draw-1 variant, even with optimal play.
7Klondike Solitaire was originally created by Microsoft intern Wes Cherry in 1989 as a way to teach users how to drag and drop with a mouse.