Cards in the tableau are built down by suit and every face up card is available for play, no matter where in the column it is. That means that any card can be placed on top of a card that is a rank higher. Once a card from the bottom or middle of a column is moved, all cards on top of it are moved as well, as one unit. Nothing can be placed on an ace and gaps on the tableau can only be taken by kings or sequences with Kings as their top cards. Once a face-down card is exposed, it is turned face up.