Call of Duty: World at War's announced four player co-op mode certainly put the game into the collective mind here at Co-Optimus. Well, it seems like the crew at Treyarch have co-op on their mind this week. The latest blog entry into their IGN blog is entitled "Building Co-Op From the Group Up." In the blog post, they discuss cooperative and competitive co-op, as well as the design behind them. In the blog, they also discuss the risk they were taking by adding co-op to a Call of Duty game.

After all, there is a certain trend-setting standard that you have to live up to with each new Call of Duty title – this would be the first time in the title’s history that players would be able to play online together through the kinds of levels that were previously only playable in Single Player.

The blog post is very informative, and gives great insight as to why World at War has co-op. Hit up the link and check it out.

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