Serious Solitaire

Serious Solitaire features over 100 card games, ranging from Free Cell,
Spider and Sir Tommy (and variants) to several original creations. The
implementations include variable card backs, optional sound, AutoPlay (for
cards which are ready to go to the foundations), and various visual effects.

You can practice the games, or play Quick Challenges, in which you must reach
a certain percentage in eight different games to unlock a ninth, with bonus
cheats unlockable for winning games outright. Career mode gives you 12
increasingly difficult challenges

The full challenges involve a sequence of 4 card games of increasing
difficulty, themed around a particular group of games. Unlocking the next game
in each one you have a percentage target to reach across a set number of
games. The game constantly updates the percentage you require in the current
game to win the challenge outright, realizes when you have an average high
enough as to be sure to complete this, and when you can’t reach the target
(even if you have games in hand).

Serious Solitaire