Minimum System Requirements
Windows
OS:
Windows Vista
Processor:
Intel Core 2 Duo 2.8 GHz or equivalent
Memory:
1 GB RAM
Graphics:
DirectX 10 compatible video card with shader model 3.0 support
Storage:
2 GB available space
Notes:
Version 10; 100% DirectX 9.0c compatible sound card and drivers; Xbox360 Gamepad recommended
macOS
OS:
Lion 10.7.5
Processor:
Intel Core 2 Duo 2.8 GHz or equivalent
Memory:
1 GB RAM
Graphics:
OpenGL 3.0+ support (2.1 with ARB extensions acceptable)
Storage:
2 GB available space
Notes:
SDL_GameController devices fully supported
Linux
OS:
glibc 2.15+, 32/64-bit. S3TC support is NOT required.
Processor:
Intel Core 2 Duo 2.8 GHz or equivalent
Memory:
1 GB RAM
Graphics:
OpenGL 3.0+ support (2.1 with ARB extensions acceptable)
Storage:
2 GB available space
Notes:
SDL_GameController devices fully supported
Recommended System Requirements
Windows
OS:
Windows 8
Processor:
Intel Core 2 Duo or AMD Athlon 64 X2 5600+
Memory:
2 GB RAM
Graphics:
NVIDIA® 9600GT or ATI Radeon™ HD 5000+ or better
Storage:
2 GB available space
Notes:
Version 10; 100% DirectX 9.0c compatible sound card and drivers; Xbox360 Gamepad recommended
macOS
OS:
Latest macOS Release
Processor:
Intel Core 2 Duo
Memory:
2 GB RAM
Graphics:
OpenGL 3.2+ support
Storage:
2 GB available space
Notes:
SDL_GameController devices fully supported
Linux
OS:
glibc 2.15+, 32/64-bit
Processor:
Intel Core 2 Duo or AMD Athlon 64 X2 5600+
Memory:
2 GB RAM
Graphics:
OpenGL 3.2+ support
Storage:
2 GB available space
Notes:
SDL_GameController devices fully supported
These are the requirements the publisher lists on Steam.