Elevens is a solitaire card game using a standard 52-card deck.
Cards are placed in a 3x3 grid, and pairs of cards which add up to eleven (5 and 6; 4 and 7; 3 and 8; 2 and 9; Ace and 10) are removed from the grid and replaced with cards from the deck. Face cards (J, Q, K) may be eliminated in a set of three cards consisting of one Jack, one Queen and one King regardless of suit. If all cards are removed the game is won. If there are no more pairs of cards that add up to eleven, and there do not exist a Jack, a Queen, and a King, the game is lost.
An individual game of elevens is a game of pure chance, except for the small element of skill involved in spotting the pairs; the skill and strategic interest comes in not shuffling the cards at the end of each game, but instead collecting them up in order.
via Wikipedia