Klondike is played using a 52 cards deck (no jokers).
The mission of Klondike is to build the four foundations (the four rectangles in the upper right part of the screen) by suit from A(ce) to K(ing).
According to studies, the number of unsolvable Klondike games is 9 to 18 percent.
In 1 out of 4000 games, no cards can be moved at all!
The tableau piles can be built down by alternate colors e.g. Red-Black-Red or Black-Red-Black.
Complete piles or partial complete piles can be moved only if they are built by alternate colors.
An empty pile can be filled with a pile of cards with a King on the top, or just with a King.
There are few different ways of dealing the upper stack, depending on the game's version- limiting the number of passes through the deck, unlimited number of passes, turning one or three cards at a time.