Can I play the game using my Magic Mouse or Magic Trackpad?
However, you must first enable the secondary click function on your mouse or trackpad. This will enable you to perform a right-click by clicking the right-hand side of your mouse or trackpad.
To do this, follow these instructions:
Open System Preferences ( Menu → System Preferences).
Select Mouse or Trackpad (depending on which you are using).
Select the Point & Click tab.
Check the Secondary Click checkbox.