Minimum System Requirements
Windows
OS:
Windows XP
Processor:
Intel Core Solo
Memory:
128 MB RAM
Graphics:
64MB RAM
Storage:
200 MB HD space
macOS
OS:
OS X version Leopard 10.5.8, Snow Leopard 10.6.3, or later.
Processor:
Intel only, Power PC not supported
Memory:
128 MB RAM
Graphics:
64MB RAM
Linux
OS:
Ubuntu 10.04 and Newer
Processor:
Intel Core Solo
Memory:
128 MB RAM
Graphics:
64MB RAM
Storage:
200 MB HD space
Recommended System Requirements
Windows
OS:
Windows 7
Processor:
Intel Core Duo 2.0 Ghz and above
Memory:
512 MB RAM
Graphics:
256MB RAM, non-integrated
Storage:
200 MB HD space
macOS
Processor:
Intel Core Duo 2.0 Ghz and above
Memory:
512 MB RAM
Graphics:
256MB RAM
Linux
OS:
Ubuntu 10.04 and Newer
Processor:
Intel Core Duo 2.0 Ghz and above
Memory:
512 MB RAM
Graphics:
256MB RAM, non-integrated
Storage:
200 MB HD space
These are the requirements the publisher lists on Steam.
