Split-screen co-op for Oblivion (2006)
Claude Code reverse engineered Oblivion through a Ghidra server and wrote an xOBSE plugin adding two-player split-screen co-op.
The full story
Oblivion never had co-op, so the poster built it with Claude Code: two controllers on one PC, a second player with their own character, and a split screen. Most of the work was reverse engineering, with Claude reading the game's code through a Ghidra server and writing C++ hooks as an xOBSE plugin, covering menus, levelling, crafting and riding for player 2.
Claude built a harness that launches the game and plays it with two virtual controllers, now with 179 scenarios; an early test passed while player 1's camera was on the floor, so checks look at the actual picture. It was released free as a beta on Nexus, and early player bug reports were fixed within days.
How it was done
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Sources
From a short post by the maker, so the details are as they tell them.
- Reddit: Oblivion(2006) Splitscreen mod made with Claude Code
The maker's post on r/ClaudeAI.
The poster has deleted it, but the original is still readable (it can take a few seconds to load): archived copy of Reddit: Oblivion(2006) Splitscreen mod made with Claude Code (opens in a new tab)