Closing an application's window will close the application. Unfortunately, Macintoshes only come with a one button mouse. To get this to work, you first have to select pc mouse emulation under the setup menu on the macinotsh application menu bar. If there is no menu bar appearing at the top of the screen, just hold down the apple key and it will appear. You can practice using multiple buttons in the Minesweeper game in the games group.
Game play is explained in the help file.
Because Minesweeper comes with windows, the help also contains help with help and other confusing things. Select contents to actually find game rules.