X11 Solitaire Card Game
Sol is a card game for lonely persons, highly inspired by the game bundeled with a well known non-Unix "operating system". I assume the motive of the game is well known, so I won't go into any details here.
The game features a site-wide highscore file, containing the top 200 players. Each user may appear once only in the highscore table. The highscore list is sorted on the time taken to bring the game to a solution.
You may download the game from my Software for Unix/Linux page.