Games for Assisted Living Residents

Simon Says was always good for laughs. We did it a couple of times in the 8 weeks I spent at a nursing home. It can be played with as many or as few as are present.

Solitaire, jigsaw/crossword puzzles, word search for just one person to play.
For more than one player, Checkers, Yahtzee, Dominos, Trivial Pursuit, Bingo, and other board games.

Are you looking for games that involve large groups or games that can involve 1 - 4 players (for example to have at different tables)?