How to Increase Available Memory
Macintosh

If you have less than 240 MB of available system memory, but have at least 128 MB of built-in memory, you can increase your virtual memory to make up for the missing system memory:

• Open your Control Panels > Memory
• Turn on Virtual Memory and set the amount of memory in the field to "260M" by holding down the up arrow.
• Close the Memory Panel
• Restart your computer
  -->Make sure you have no other programs open while you play the game.

NOTE: You must have at least 128 MB of built-in memory for the above method to work and for the game to play well.