Try to build a house of cards. Make sure the foundations and lower layers are strong enough to support higher layers. Walls are pairs of the same value or suit. Roofs can be any card. Walls of 20 and 21 in value have special capabilities.
Seahaven Towers Solitaire, move all cards to the foundations from Ace to King. On the tableau you must build down in suit. Every new level is more difficult restricting the number of cards you can move or what the starting card of an empty column must be.