In the early-to-late 2000s, Halo was the unrivaled king of the sci-fi shooter market. A market once dominated by a green-clad space marine fighting demons in Doom had come full circle, with a new green-clad space marine fighting aliens in Halo. But this lack of strong competition wasn't for a lack of trying.
During the 2000s, top studios around attempted to wrestle control of the sci-fi shooter away from Halo, and while some got close, the vast majority failed. These unsuccessful usurpers have been given a name over time: 'Halo Killers.'
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Coming hot-off-the-heels of the incredibly popular and successful Call of Duty 2, developer Infinity Ward was tasked by Treyarch to create another game in the series, giving them freedom over what era they'd like to set the game in. Initially, the plan was to make just another World War 2 shooter, simply naming it «Call of Duty 4.» But the development team had another idea.
The Infinity Ward team would be split into distinct teams, one working on the World War 2 shooter and one working on a brand-new project, titled 'Halo Killer.' The plan was simple, to take Call of Duty's responsive gameplay and mechanics and give them a sci-fi makeover, deliberately to compete with Xbox's flagship property.
Development on 'Halo Killer' didn't get very far, however, as Infinity Ward's resources were stretched much too thin by working on two big-budget games at once. The decision was quickly made to join the teams back together, now with a central focus on a Call of Duty game set in the modern day. This turned out to be a pretty smart move, as Call of Duty 4: Modern Warfare, as it would be titled, sold more units than Halo 3, with the
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