Build a House with playing cards. Stack your cards carefully. For the walls: click on 2 cards of the same suit or of the same value. For the roofs: pick any card. The walls need to be supported by pairs with equal or higher pair value or your house will collapse. Special pairs: Pairs with a value of 20 can be placed on top of any other pair (even lower values). A pair with value 21 can be placed anywhere and will strenghen the walls directly below.