Smooth playing, many Solitaire variants
Although I mostly stick with Spider, I’ve tried all the games in the Full Deck package and have no complaints about any of them. The instructions are all very clear (though a new style of Solitaire is hard to fully get until you’ve played it). I particularly like that the undo option is readily usable, including with the usual keyboard shortcut, and that you can go back as far as you need to. The stats kept are useful, as well.
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Full Deck Solitaire