Castle solitaire card game
The objective of Castle solitaire is to erode the "wall" stacks on the sides of the layout by placing their contents in the suit stacks in the middle. Castle can be considered "FreeCell without free cells", but card stacks do not need to have alternating colors and the aces are already removed to compensate (partially) for the lack of free cells.

There are two types of card stacks:

• Building Stacks There are four building stacks on the left and right sides of the layout. A building stack can accept a card of any suit provided that the card's rank is one less than the rank of the card currently at the top of the stack. An empty building stack can accept any card from the top of another stack.
• Suit Stacks The suit stacks are located in the middle column of the layout and initially contain an ace. Suit stacks can accept a card from the tops of the building if the suit is the same, and the rank is one more than the rank of the card at the top of the stack.

NOTE: Internet Explorer may block this game because it cannot verify the publisher, but the game works fine in other browsers such as Firefox, Safari, Google Chrome, and Opera.

Thanks to Andrew Pipkin for providing this program.