The objective of the game is is to move all cards from the three Peaks onto the Waste. You can only move open cards to the Waste, a card is considered open if there are no other cards covering it. At the beginning the whole bottom row is open. Once you move cards from the Peaks you open up other cards that you can then flip over and are then open to move to the Waste as well.
You can move a card onto the Waste if it ranks one higher, or one lower than the topmost card on the waste. E.g. if there's a 6 on the Waste you can move a 5 or a 7 there. Initially the Waste is empty and you can move any card there. You are allowed to "turn the corner", i.e. go K A 2 A K, you can put an Ace on a 2 or a King.