Recommended Hardware:

PC: XP/Vista/7
Processor: 1.6 GHz
Memory: 512 MB
Hard Disk Space: 600 MB
Video Card: 128 MB
DirectX®: 9.0 or higher

Mac: OS X Leopard 10.5.8, or later.
Processor: 1.6 GHz (INTEL ONLY)
Memory: 512 MB
Hard Disk Space: 600 MB
Video Card: 128 MB

Both:
Internet Connection
Mouse with Right/Left click