"Solitude for Windows is a collection of 91 freeware solitaire card games."
As you may or may not have already worked out, Solitude for Windows is a collection of solitaire card games. There are 91 different games, among which are included many well-known ones, like Four Seasons, Blind Patience, Poker or the Pyramid.
In this Solitude for Windows pack there are also games invented by the author: Wave Motion Solitaire, Fire and Ice, Four Kingdoms. Solitude contains a set of games that try to represent the spectrum of card-based solitaire games (of which there are countless variations). Some unique games not often found in many other collections include Sid Jackson's great Bowling Solitaire and David Parlett's Black Hole.
Solitude for Windows automatically saves the statistics of all the games, you can select your favourite games, and once inside each one you can undo the games using the function of the same name.