Double Klondike

Double Solitaire is a two-player variant on the best-known patience or solitaire card game called Klondike. While it is mostly referred to as Double Solitaire, it is sometimes called Double Klondike (a name which also doubles as an alternate designation of the single-player solitaire game Gargantua). Games with more players (Triple Solitaire, Quadruple Solitaire, etc.) are also possible.

As the name suggests, Double Klondike is a two-player game, and is played with two full packs of playing cards, minus the Jokers; for the purpose of Double Klondike, the cards should be of the same size, but each pack's cards should be distinguishable from the other packs in some way, such as a different font style on the cards' faces or different backing designs for each pack.