Forty Thieves Solitaire

Forty Thieves is one of the most popular solitaire games played today. If you haven't tried it yet, now is the time!
Forty Thieves is similar to the solitaire game you are used to, but with simpler rules and more exciting play. You start with two decks of cards and can only move one at a time. As the game progresses, your card stacks get larger until, usually at the last minute, it all comes together and you can move most of them to the foundations above.
This version features unique playing cards that reflect an "Arabian Nights" style. The game plays in both horizontal and vertical orientations, and you can switch easily between them as you play.
This game also features an Undo function, and the ability to flip the waste pile over at the end of a game to continue playing if you wish.