Colorado Solitaire

In Pyramid Solitaire, the player is attempting to match two cards together that have a rank that totals 13. The cards are dealt into a pyramid shape.

In Volcano Solitaire, is a two deck version of Baker's Dozen Solitaire where the cards may be built up or down in the piles, and half the foundations are built down.

In Hamlet Solitaire, is a two deck version of Baker's Dozen Solitaire. The cards are dealt into 13 piles, with Kings moved to the bottom of the pile.

In Fortress Solitaire, a single deck of cards is dealt into 10 piles, and the player may begin the foundations with any card. The piles may be built up or down regardless of suit.