Anthropic has added a restriction to Claude Code aimed at stopping users from recreating existing video games, including copies passed off under a different name. But developers say they’re also running into refusals while working on projects they consider legitimate, raising questions about how accurately Claude applies its rules.
In brief:
- Claude Code has a new instruction targeting recreations of specific existing games.
- Anthropic says original games, genre-based projects, and users’ own designs should remain supported.
- Developers have reported refusals affecting their own projects and reverse-engineering work.
- Anthropic has acknowledged the restriction and invited feedback about mistaken refusals.
What Changed in Claude Code’s Game Development Rules?
According to Game Developer, X user Chasm identified a rule reportedly introduced around October 27. The instruction allows original projects and games built within an established genre, while telling Claude to reject recreations of particular existing titles. Renaming a copy or describing it as original doesn’t change that instruction.
Anthropic’s Addy Osmani subsequently confirmed that the company added two sentences to Claude Code’s prompt on Opus 5.5. He said the change was intended to steer the tool away from recreating other people’s games in ways that violate Anthropic’s intellectual property policy. An Anthropic spokesperson directed Game Developer to his statement.
Developers Report Refusals on Their Own Game Projects
The complaints extend beyond requests to clone commercial releases. Tom’s Hardware reported users encountering refusals during ordinary game development, reverse engineering, crash dump analysis, anti-cheat development, and security reviews.
These remain user reports, and the cause may vary. Some refusals involve cybersecurity safeguards, so attributing every blocked task to the new game-recreation instruction would go beyond the available evidence.
One example covered by The Next Web involves the owner of Conflict Simulations LLC, who reported problems building digital board-wargame modules for customers. The developer argued that Claude was blocking commissioned professional work and requested a way to verify legitimate projects.
Their follow-up also complicates the picture, as they said refusals began after asking Claude whether the rule applied, while new sessions continued working on the same code. That suggests the experience can depend on the conversation, rather than every game-related request receiving the same response.
AI Game Cloning Concerns Are Already Affecting Developers
The restrictions arrive as studios worry about AI tools copying their games before release. Alliance Arts cancelled the public demo for its upcoming Steam title Drunken Goddess Reflux over concerns that its presentation and gameplay could be replicated using AI.
Protecting unfinished games from rapid copies addresses a real concern for creators. The complaints around Claude also show why developers want clearer handling of original projects and authorized work.
Anthropic Says It Will Refine the Restrictions
Osmani said Anthropic would keep adjusting the implementation and asked users to flag cases where Claude rejects their own projects. Original games and projects using users’ own designs and assets are intended to remain supported.
As of writing, developers have a confirmed explanation for the recreation rule, while the broader reports of mistaken refusals still need individual investigation.
