Darkest Hour: Europe '44-'45 is an add-on/modification for Red Orchestra: Ostfront 41-45, thus Red Orchestra is required to play Darkest Hour.

Red Orchestra is available through Steam for $9.99 and can be purchased from Steam's Web Site. Some stores and online retail sites sell the game as well.

Red Orchestra and Darkest Hour System Requirements:

• Minimum: CPU: 1.2 GHZ or Equivalent, 512 MB RAM, Video Card: 64 MB DX9 Compliant, 2 GB free hard drive space, DX 8.1 Compatible Audio, Windows 2000/XP
• Recommended: CPU: 2.4 GHZ, Video Card: 128 MB DX9 Compliant with PS 2.0 support, Sound Card: Eax Compatible