Sources and verification

Sources consulted

• Gargantua (card game) (new tab) (Wikipedia (in English)): the two-deck Klondike solitaire: 9 columns dealt as in Klondike, 8 foundations built up by suit from the ace, only a king on an empty space; the stock goes through only twice there, whereas the app lets you recycle without limit in Normal
• Double Klondike (new tab) (Wikipedia (in English)): the name "Double Solitaire" also refers to a two-player game with shared foundations; the app, however, is played alone
• Klondike (solitaire) (new tab) (Wikipedia (in English)): rules of single-deck Klondike, ways of drawing (1 or 3 cards), origin of Vegas mode
• Solitaire (patience) (new tab) (Wikipedia (in French)): French names of the game (solitaire, réussite) and origin of the word Klondike

Links accessed on October 30, 2026. The rules described on this site are first and foremost those of the Double Solitaire app, read from its code.

How the examples are verified

Before each release, a program checks the 4 example deals and every number on the site:

• the deal is recalculated from its game code, with the same shuffle as the app, and compared with the one produced by the app's code;
• 104 cards, each present twice (two 52-card decks), columns of 1, 2, 3, 4, 5, 6, 7, 8 and 9 cards, 59 cards in the stock;
• every move of the games is replayed and must be allowed by the app's rules; the game must end won;
• the score and the number of actions, draws and recycles are recalculated and compared with those of the app;
• the rules cited (empty column, foundations, stock, Normal and Vegas scoring) are re-read in the app's code.

Strategy tips are presented as tips, separate from the rules. Figures taken from the literature are attributed to their source and do not describe the app. Found a mistake? Write to us through the contact page.