A Decktet solitaire game that does not require a playing surface. It involves melding cards through collections of suit cards, collections of cards that share a rank, and collections of consecutive ranks that share a suit. After going through the deck twice you count the number of unmelded cards and that is your score. The lower the score the better. A "head solitaire" is a kind of solitaire that requires no playing surface. Many were popular during the era of British sailing merchant ships. Link to wiki article: http://wiki.decktet.com/game:head-solitaire