Monte Carlo is a pair-matching patience or card solitaire game using a pack of 52 playing cards where the object is to remove pairs from the tableau.

Alternative names for this game include Good Neighbours and Weddings.

[2] The game is set up by laying out 25 cards so that they form a 5x5 grid.

Cards that make up a pair (such as two Kings or two Sixes) are removed when they are immediately next to each other horizontally, vertically, or diagonally.

[3] This process is repeated continues until it is no longer possible to remove pairs (e.g. in the finishing stages of the game one might be stuck with "4-6-4-6.").