Calculation is a new card game that differs a bit from Solitaire but requires just as much skill. The goal is to get all the cards into the foundation. There is a box of numbers under each of the foundations to show you what cards the solitaire game will next expect in that spot. You may only turn one card at a time. You must then place it strategically into the tableau. Move cards into the foundations when you draw them. Win by getting all the Kings into the four foundations!