You can find several games in the -> area of the IceWM program menu. Instead of documenting all the games on your computer, we will mention quirks of certain games.
The Ace of Penguins is a suite of (rather addictive) solitare games, including Freecell, Minesweeper and Taipei. Most of the games offer online help that you can access by pressing F1. Each helpfile documents the rules of the game in question, how to win, and the keys used to start new games.