Operating System: OS X version Snow Leopard 10.6.3, or later.
Processor (CPU): 2.0+ GHz
Memory (RAM): 2 GB RAM
Graphics Card: OpenGL 2.1 and shader model 3 with 512 MB of memory.
Hard Drive: 500 MB HD space
Additional: Not recommended for Intel integrated graphics, Mac Mini's, or early generation MacBooks
Online: Steamworks required for online play, LAN not supported on Mac