Call of Duty 2 is the second installment of the Call of Duty series developed by Infinity Ward. It is a first-person shooter game that runs on Windows and Mac OS X devices. In COD 2, you take on the role of young soldiers whose sole duty is to fight in the war. You will fight in across three interwoven campaigns, each with a different time period. The plot is predominantly linear but you can jump between campaigns so you can experience each country – Stalingrad, Africa, and France – at your own pace.