PC Gamers Left Out of Halo's Couch Co-op — Until Modders Unlocked Hidden Code

When Halo: Campaign Evolved launched across PC and consoles, most players assumed the experience would be consistent across platforms. That assumption turned out to be mostly correct — with one glaring exception. PC players discovered they had no access to local split-screen co-op, a feature fully supported on both PlayStation 5 and Xbox Series X/S. The omission was baffling enough on its own, but it became even more puzzling once modders started digging into the game's files.

A mod now available on Nexus Mods — first spotted by PC Gamer — has cracked the problem open entirely. According to the mod's description, the split-screen functionality was never truly absent from the PC build; Halo Studios had simply switched it off. Every UI element required to run local co-op in split-screen mode was sitting intact inside the PC version, mirroring what console players enjoy. The mod works by invoking that existing code at runtime using UE4SS, clearing the two blockers preventing a second local player from registering, without modifying the game's executable file at all.

Despite the clever approach, the mod arrives with a handful of limitations that keep it from feeling like a polished solution. Players must trigger the feature via a hotkey, which creates awkward friction for anyone running the game through a Steam Machine or a living room setup. Split-screen support is also capped at two players, falling short of the four-player local co-op available on consoles. Additionally, the mod has only been tested and confirmed working on the Steam version of Campaign Evolved — those accessing the game through Game Pass or the Microsoft Store may be out of luck entirely.

Further quirks compound the experience. Community feedback in the mod's comments section suggests both participants need to use controllers for the feature to function, ruling out mixed input configurations. A subtitle rendering bug causes captions to bleed across both screen halves rather than displaying independently per player, which can significantly hamper accessibility and immersion during story beats. These are the kinds of rough edges that tend to accompany early-stage mods, though they sting a little more given the circumstances.

Adding another layer of complexity, the mod's creator reportedly used Anthropic's Claude Code AI assistant to handle portions of the development work. That disclosure raised questions in the community about how actively and knowledgeably the creator will be able to iterate on the project over time. Meanwhile, separate technical analysis has shown that Campaign Evolved performs better on PS5 than Xbox Series X in standard configurations — a detail that, combined with the missing PC feature, paints a slightly uneven picture of the game's multiplatform rollout.