It covers various campaigns from World War II. You play as the Allied Forces: United States, Britain, and Russia. With each mission being a little different from the one before. I beat the game in a matter of days, but that was playing the game for hours on end.
The single-player gameplay is excellent. (i haven't played straight through a single-player storyline since Half-Life!) It has some very tough parts, certain points in the game you think it's impossible to beat. It's quite addicting in the middle of the game, and at the end it's a feverish pitch to keep pushing forward.
The multiplayer online play is just as feverish. The gameplay is constant, and if you're looking for more man-to-man gun battles than Battlefield 1942, Call of Duty might be your game. I was very impressed with the graphics, and the way I got so caught up in it. Definately worth a look.
Download the demo from the official Call of Duty website or any file-hosting site.
