Windows版本：
OS: Windows Vista, 7, 8, 10
Processor: Intel Pentium 4 Intel Core AMD Athlon 2.2GHz+
Memory: 2 GB RAM
Graphics: NVidia GeForce FX 5900 Ultra ATI Radeon 9800 Pro Intel GMA X3100 256MB VRAM
DirectX: Version 9.0c
Hard Drive: 3 GB available space

Mac OS X版本：
OS: Mac OS X 10.7, 10.8, 10.9, 10.10
Processor: Intel Core 1.8GHz+
Memory: 2 GB RAM
Graphics: NVidia GeForce 7300 GT ATI Radeon X1600 Pro Intel GMA X3100 256MB VRAM OpenGL 2.0 compliant
Hard Drive: 3 GB available space

Steam OS + Linux版本：
OS: Ubuntu 12.04 LTS Linux
Processor: Intel Pentium 4 Intel Core AMD Athlon 1.8GHz+
Memory: 2 GB RAM
Graphics: NVidia GeForce 7300 GT AMD Radeon HD 2400 Pro Intel HD 3000/4000 256MB VRAM OpenGL 2.0 compliant
Hard Drive: 3 GB available space