Its basically a modern day version of Doom, but much harder. The level and monster designs were really nice and would fit perfectly in the Doom universe. The enemy AI is much more aggressive and they are very fast and can easily overwhelm you. The bosses are well designed and they are very tough to beat. I played it on my new desktop computer (AMD Llano A8-3820 with Radeon 6550D integrated graphics and 6Gb ram) and the game ran smooth on high. All in all, i enjoyed the game and it was worth the small price i paid for it in the 1C bundle. There is only 12 levels and i finished it in about 10 hours.