A Pokemon fan game creator says Claude has started refusing to work on the project after they claimed to spend up to $2,000 a month developing it and working 10 to 14 hours a day.
Big Kid Nation is behind Pokemon Arena 2D, a free real-time arena battler built around pixel-art Pokemon visuals. The project’s website says it has been in development for two years, with a public beta planned for December 2026.
In an October post, the creator said the project cost “up to $2,000” in monthly expenses while they spent 10 to 14 hours a day learning and building it. They also pushed back against people calling the project “AI slop,” insisting it would be free for everyone.
Big Kid Nation’s profile describes the creator as “Pro Ai,” and they have openly discussed using AI for most of the project’s development. The team used heavy AI tools to prototype mechanics, balance and ideas, while also claiming that a human team is growing around the project.
Claude is now refusing Pokemon assets #
On November 11, Big Kid Nation claimed Anthropic had “cracked down” and that Claude models were starting to refuse work on Pokemon fan projects.
The creator’s follow-up screenshot shows Claude declining to use Pokemon sprites in the game, even after being told the files were stored on the developer’s own computer. Claude reportedly suggested replacing the Pokemon characters with original fighters filling the same roles.
Reports suggest the refusals may extend beyond Pokemon Arena 2D. Tests reportedly found Claude declining requests involving recognizable Pokemon characters, sprites, logos, names and designs. Anthropic has not announced a Pokemon-specific policy.
The broader restriction first surfaced in late October, when X user Chasm posted a server-delivered Claude Code rule telling the model not to recreate a specific existing game, even if it was renamed or described as original. Anthropic staff member Addy Osmani later confirmed the change, saying original games and projects using a creator’s own designs should still be supported.
Anthropic staff member Addy Osmani later confirmed the change, saying Claude Code’s Opus 5.5 prompt had been updated to steer it away from recreating specific existing games because using Claude to infringe intellectual property violates Anthropic’s usage policy.
He added that original games, genre projects and games built from a user’s own designs and assets should still work.
That explanation framed the change as a narrow response to AI-made game clones. The Pokemon reports suggest the guardrail may now be reaching beyond recreating an entire game, with Claude also refusing recognizable characters, sprites, names and logos.
Anthropic later adjusted the rule so users could reference an existing game to describe a genre or mechanic, while direct copies would still be rejected. The Pokemon-specific refusals were reported after that change, leaving the exact scope of the restriction unclear.
Other developers say Claude is blocking their work #
The controversy has spread beyond one Pokemon project. A thread on r/PokemonROMhacks about Claude refusing Pokemon fan-game and ROM-hack requests drew more than 1,800 upvotes.
Some users welcomed the move as a way to reduce low-effort AI projects, while others argued that Claude should still help with human-made ROM hacks and coding assistance.
Several commenters claimed the model still works for certain modification and decompilation tasks, suggesting the restriction is inconsistent rather than a total block on Pokemon development.
A separate Reddit post came from the owner of Conflict Simulations LLC, a board-game publisher who said their business relied on Claude Code across multiple paid accounts.
They claimed Claude began refusing to build digital modules for games owned by their clients, with support allegedly saying the rule applied to all customers and had no exemption process.
The publisher said they had moved their workflow to Kimi and Codex after the refusals. The complaint shows why the policy has angered some paying users who believe they were using Claude for legitimate work rather than piracy.
Big Kid Nation has not announced that Pokemon Arena 2D is canceled. The project’s website still lists a December beta and describes it as a free, unofficial fan game. Whether it can maintain its current AI-assisted workflow remains unclear.