Halo: The Master Chief Collection Testing Phase May Be Delayed

Testing for Halo: The Master Chief Collection was meant to begin this month, but there could be a delay, says 343 Industries.

Season 6: Raven - MCC Season - Halopedia, the Halo wiki

Halo 1 PC beta tests, Halo Reach PC fixes delayed to undetermined time

You cannot replay campaign missions in Halo Infinite, and there are missables (skulls, audio logs) : r/halo

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Does Halo need to move away from MasterChief and focus on more Games like Reach and ODST? : r/halo

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Halo: MCC, July 2023 Update