Other games may be best for four. Some games require very little interaction and some are extremely social. Some are hard to teach newcommers and others require much study. Only the most basic, useful and widely played games will be listed. I will attempt it anyway.
Some games appear in more than one category.
Klondike - This is the classic. An extremely popular game probably being the best known Solitaire game in existence. Spider - A powerful 2 deck solitaire. Many players feel this is the best of all the solitaire games. My favorite 2 deck solitaire.