Klondike Solitaire can be played for free at Solitr.com without downloading. Two difficulty levels of the game are available, along with instructions of how to play.
WorldOfSolitaire.com also has a free version of Klondike Solitaire. The site has a timer at the top of the screen, along with a move counter and a scoreboard. Players can customize the background and the design of the playing cards.
Klondike Solitaire is a popular card game that requires the player to separate all 52 cards into their own suits. It is part of the 'patience' genre of card games that became popular in the 19th century.