Short answer: On 30 October 2026 XDA Developers reported an instruction in Claude Code telling the model: “Don’t build a recreation of a specific existing game, even if it is renamed or called original.” On 12 November TheGamer reported, citing Automaton, that users say Claude now also refuses to generate Pokémon-based assets for fan games. Anthropic had not, in the sources we read, published a full explanation of how widely the rule applies. The practical lesson for developers is not to guess: keep dated records showing which parts of your project are your own designs, code and assets, and which are licensed or third-party. A TimeBind dates the files you hold. It does not show that you have the right to use someone else’s characters, and it does not show how an AI tool will behave.
Last checked 13 November 2026. General information for game developers, modders and fan-project makers, not legal advice. This page reports what outlets and users said. It does not say how Anthropic applies the rule, and it does not say which fan or port projects are lawful.
Table of Contents
What was reported
XDA Developers (30 October 2026) said a Claude Code user known as chasm shared an instruction delivered from Anthropic’s servers through a configuration field called tengu_heron_brook. The instruction reads: “Do build original games, games in a genre, and games from the user’s own designs and assets. Don’t build a recreation of a specific existing game, even if it is renamed or called original.” XDA said it found the same text in version 2.1.314 of the Claude Code binary and that the field is a general-purpose mechanism Anthropic uses to adjust instructions remotely, not a flag made only for games.
XDA tested the model. Asked to recreate Pokémon Diamond, both models it tried refused. Asked about reverse-engineering work, the newer model said it could help with decompiling a game from the user’s own ROM copy and with a static recompilation, and it separated those from recreating a game. XDA concluded the restriction may be narrower than first feared, but said it was unclear how widely Anthropic had deployed it. XDA also reported that on 30 October a developer filed a GitHub issue saying the model refused to help with digital board-game modules built for paying customers who owned the physical games. XDA had not reproduced that refusal.
On 12 November TheGamer reported that, according to Automaton and users, Claude had begun to refuse Pokémon fan-game requests, including asset generation using sprites that clearly look like Pokémon characters. TheGamer described this as anecdotal and as probably an extension of the earlier rule. Treat the Pokémon-specific detail as unconfirmed.
Why this matters to developers who never touch fan games
An AI tool’s refusal is not a legal ruling, and an AI tool’s willingness is not permission. But the episode shows two practical risks. First, a tool can change what it will do overnight, through a remote setting you cannot see, in the middle of a project. Second, a refusal can hit legitimate work that sits near the line: licensed adaptations, client commissions, engine re-implementations, mods. If you cannot show where your assets, code and designs came from, you are left arguing from memory.
The other side of this is the one Anthropic’s rule names: original games and games from your own designs are the cases it says it is meant to keep working. A dated record of your own designs and assets is the easiest way to show which side of that line a project sits on, to a collaborator, a publisher, a storefront or a support desk.
Why people are searching for this
Measured on 13 November 2026. On X, chasm’s post (30 October) about the rule had 2,425,769 impressions and 9,198 likes. A second post, from @0x0SojalSec the same day, had 6,479 impressions and 75 likes. XDA and TheGamer both covered the story (30 October and 12 November). Google autocomplete in the United States returned “claude pokemon game” on 13 November. Counts keep moving.
Checklist for game developers
- Keep an asset log. One line per asset or system: what it is, who made it, where it came from, the licence if any, and the date added. Original, licensed and third-party items should be clearly separate.
- Keep your original design documents and early prototypes. Concept art, design docs, early builds and sketches show where your game’s ideas came from. Keep them as dated exports, not only inside a tool.
- If you work from someone else’s game, keep the permission. A fan project, mod, port or adaptation needs its own answer about rights. Keep the licence, the email or the written permission, with the date, and read the owner’s fan-content policy if one exists.
- For client work, keep proof of what the client supplied. If a client gives you materials they say they own, keep their message, any licence, and a note of what you were asked to build. See the game clone record checklist.
- Keep your AI-tool use log. Note which tool and model you used, for what, and the date. If a tool starts refusing partway through a project, you can show what existed before and after.
- Do not rely on a tool’s rules staying put. Save a dated copy of the terms, policy page or announcement you relied on, and keep a build you can continue without the tool.
- Date your builds before sharing them. Fingerprint a release build, the source tree and the asset manifest before you send them to a publisher or post them. See timestamping video game assets before sharing.
What a TimeBind does and does not show
A TimeBind is a dated, checkable record that an exact file existed no later than a recorded time and still matches. The SHA-256 fingerprint is made in your browser and the file is never uploaded. The record is anchored to Bitcoin (a Merkle root in an OP_RETURN). Your first Pooled TimeBind is free; after that, TimeBinds start from US$5, and an ASAP TimeBind is US$15. See how it works.
For a game, it can date a design document, an asset manifest, a source archive or a release build as you hold them. It does not show that you own or may use any character, sprite or music, does not show that a project is original, and does not show how any AI tool decided what to do. Use it as one dated record next to your licences and permissions.
Limits
This page relies on XDA Developers (30 October 2026), TheGamer (12 November 2026, citing Automaton) and the X posts counted above. We have not seen Anthropic’s own explanation of how the rule is applied, and we cannot say which projects it covers. Where we say a detail is unconfirmed, it is. This is not legal advice about fan projects, ports or copyright.
Tools that can help
Use the bulk SHA-256 manifest to fingerprint a build folder, and the game clone record checklist to gather what you would want to show a publisher or storefront. For related reading see what game developers should keep after the itch.io AI filter debate.
Frequently Asked Questions
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What exactly did the instruction in Claude Code say?
As quoted by XDA Developers: “Do build original games, games in a genre, and games from the user’s own designs and assets. Don’t build a recreation of a specific existing game, even if it is renamed or called original.”
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Has Anthropic confirmed that Claude refuses Pokémon fan games?
In the sources we read, the Pokémon-specific refusals come from user reports relayed by Automaton and TheGamer. We did not find Anthropic confirming a Pokémon-specific rule.
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Does the rule stop reverse engineering and decompilation?
XDA’s tests suggest not outright: the model it tested said it could help with decompiling from a user’s own ROM copy. XDA also said it was unclear how widely the rule is deployed, so results may differ.
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Can a TimeBind show my game is original?
No. It shows that exact files existed no later than a recorded time and still match. It does not show originality, ownership or licence rights.
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Can a TimeBind stop an AI tool refusing my request?
No. It does not affect any tool. It can date your own designs, assets and builds so you can show what you held and when.
Sources checked
- XDA Developers, “Anthropic seems to be testing a potential crackdown on vibe-coded ports of existing games,” 30 October 2026, https://www.xda-developers.com/anthropic-testing-potential-crackdown-on-vibe-coded-ports-of-existing-games/ (read 13 November 2026)
- TheGamer, “Claude Reportedly Refusing To Pull From Pokemon For AI Generation,” 12 November 2026, https://www.thegamer.com/claude-refusing-ai-generate-pokemon-assets/ (read 13 November 2026)
- Automaton, report on Claude refusing Pokémon-related generation, 12 November 2026 (as cited by TheGamer; seen in search results 13 November 2026)
- X posts by chasm and @0x0SojalSec (30 October 2026) and Google autocomplete (US), checked 13 November 2026
Date your designs, assets and builds before you share them
Your first Pooled TimeBind is free, with no credit card required. After that, TimeBinds start from US$5, and an ASAP TimeBind is US$15. Click here to start, or see plans and pricing.
