From Ambrosia Software:
Mondo Solitaire is solitaire done right, with 300+ game variants, slick graphics, and a user interface that's been designed especially with the Mac in mind. Mondo Solitaire's beautiful, crisp graphics let you easily identify your cards and assess your current move, and it plays as beautiful as it looks. Lest you think solitaire is old sauce, consider that solitaire is actually the most popular computer game in the world, and variants have been bundled on Windows since Windows 3.0. It's time for Mac users to get their due!