21 Solitaire is a collection of 7 solitaire card games based on a Blackjack theme. The object of the games is to make Blackjack hands, hands that total 21 in value. These highly original games, found nowhere else, blend classic solitaire themes with the excitement of Blackjack.

21 Solitaire's features include statistics for each game (including number of games played, average score, and your ten best scores for each game), the ability to post your game statistics on a worldwide high-score table, a fully-configurable screen background (with a user-selectable color, wallpaper, bitmap, or gradient), hands can be selected at random or by number, multimedia sound effects, a comprehensive context-sensitive help system, virtually unlimited number of undo levels (limited to one undo in the shareware version), two card sizes (allowing the game to adapt to nearly any screen size), fully-resizable game windows (with card layouts that compress and expand to handle any window size), a customizable toolbar with pop-up hints, as well as a right-click context menu, support for 16-color, 256-color, and 16-bit (High Color) graphics, and games in progress are automatically saved to disk when you exit, and automatically restored when you play again.