700 Solitaire Games Pro

700 Solitaire Games Collection is an absolute titan of a card game app. For anyone who thinks Solitaire is just 'Klondike,' this app will be a revelation. It features an incredible variety of variants, from the household names like Spider and FreeCell to obscure, highly strategic games like Forty Thieves and Yukon. The interface is exceptionally clean, allowing you to browse by skill level, deck count, or even the odds of winning, which is a fantastic touch for those looking to challenge themselves.

The customization options are where the 'Pro' feel really shines. You can edit the layout of card piles to suit your visual preference, choose from dozens of card backs, and even use your own photos as backgrounds. The inclusion of 'Smart Hints' and unlimited undo makes the more difficult games approachable, while the global leaderboards provide a reason for experts to aim for the best times. It’s essentially a library of card games that could keep a solo player entertained for years. A must-have for any card game enthusiast.