Minimum: 1.7 GHz Processor, 512MB RAM, DirectX® 8.1 level Graphics Card (Requires support for SSE), Windows® 7 (32/64-bit)/Vista/XP, Mouse, Keyboard, Internet Connection
Recommended: Pentium 4 processor (3.0GHz, or better), 1GB RAM, DirectX® 9 level Graphics Card, Windows® 7 (32/64-bit)/Vista/XP, Mouse, Keyboard, Internet Connection
We can't say much about the game since is half-life 2 same good graphics, same AI, and obviously new levels and a new enemy.
The bad thing is that, the game is short as expected you can finish it in 2 hours, but still enjoyable and challenging. What are you waiting for? Don't make Gordon wait too long and get this game!