OS: OS X version Snow Leopard 10.6.3 or later.
Processor: Intel® Core2 Duo 2.1 Ghz or better
Memory: 2 GB RAM
Hard Disk Space: 250 MB
Video Card: Any OpenGL 2.0 graphics card with 256MB+ video RAM and full GLSL support
Additional: One keyboard, controller, or mouse required per player. Supports multiple joysticks. 3-buttons required for mouse play.