Move all cards to the four Foundation piles from Ace to King in the same suit.
Using one deck, 28 cards are dealt to the layout. There are 7 Columns. The 1st Column is dealt one card, the 2nd is dealt 2, 3rd 3, up to the 7th column which is dealt 7 cards. All cards are dealt face down except for the last card in each Column.
Foundations are built UP and IN SUIT starting with an Ace and ending with a King. For example, a 2 can be placed on an A, then a 3, then a 4, 5, 6, 7, 8, 9, 10, J, Q, up to the K. The same holds true for the other suits.
Columns are built DOWN in ALTERNATING COLOR. For example, a red 6 or 6 may be placed on a black 7 or 7.
All face up cards in any Column are available for movement to another Column as long as the build rule is followed. For example, the sequence Q, J, 10 can all be moved onto the K because the connecting cards (the K and Q) follow the rule that cards are built Down and in Alternating Color.
The topmost card in any Column is available for play to either another Column or a Foundation. When a face down card is the topmost card in a Column, it is flipped face up.
Empty Columns may be filled with any card or cards that may be validly moved.
Cards from the Stock are flipped three at a time to a Discard Pile. When no cards remain in the Stock, the cards from the Discard Pile can be flipped over and gone through an unlimited number of times.
Only the top card of the Discard Pile may be played elsewhere. When a card from the Discard Pile is played then the new top card can also be played.
Solitaire Network's version of Klondike allows for any card(s) to be placed in empty Columns. Many people also play that only Kings may fill empty Columns. Solitaire Network's general approach is to be liberal with the rules. Players who wish to play that only Kings may fill empty Columns are free to restrict themselves to that rule.