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According to a press statement made by the former head of Bungie Harold Ryan, the team strove to become a private company while still loosely working with Microsoft.
“This exciting evolution of our relationship with Microsoft will enable us to expand both creatively and organizationally in our mission to creative world-class games,” Ryan stated.
Bungie retained creative control over one more Halo title with 2010’s Halo: Reach before moving on to other projects.
Source: https://www.distractify.com/p/why-did-bungie-leave-halo
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