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Call of Duty has released some unsatisfactory games over the years. Which game from the series was particularly hard to develop?

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Call Of Duty: Modern Warfare 3 multiplayer review: a tiring nostalgia trip

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Hardest game I've ever made: Before Modern Warfare 3, Another Infamous Call of Duty Game Was an Engineering Nightmare Before Being Labeled One of the Worst Games in $31B Franchise' - FandomWire

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Call of Duty Modern Warfare Remastered] #47 I've been on an FPS on the hardest difficulty kick lately. Other than Mile High Club, I thoroughly enjoyed this game on Veteran. : r/Trophies

Call of Duty: Modern Warfare 3 - Playstation 3 : Activision Inc: Video Games