Gaps Solitaire (also known as Montana or Addiction Solitaire) is a challenging solitaire card game where you have to rearrange the cards into four rows so that the cards in each row are of the same suit and in ascending order from two to king.

A card may be moved to an empty space if the card to the left of the space is of the same suit and one rank lower. An empty space in the leftmost position may be filled with a two.