Most rule books require that all face-up cards in a tableau column be moved as a unit. By holding the Option key down, you will be able to move one or more cards without moving all at once, and will be assessed a 5 point penalty. The rules do not permit moving cards from the foundations back into play in the Tableau. Doing so will incur a 5 point penalty for each infraction. Most rule books stipulate that only one pass through the deck is allowed, turning up one card at a time.
Some rule books permit turning up three cards at a time.
If you turn up three cards at a time, Klondike will allow you to make three passes through the deck before exacting a 25 point penalty for each subsequent Repeat. If you turn up one card at a time, every Repeat will cost 100 points. The game is won when all cards are face up in the tableau and foundations, with none remaining in the deck. Total scores of over 6000 can actually be achieved. Thus, the second card in a series adds five points, the third another ten, etc.