A browser-based version of Super Mario may be removed after attracting the attention of Ninetendo’s copyright lawyers, according to The Washington Post.

The Full Screen Mario site was created by college student Josh Goldberg and began garnering 300,000 unique views a day after writer and blogger Cory Doctorow blogged about it for Boing Boing.

But Nintendo has now asked him to remove the content, claiming it infringes the games maker’s intellectual property rights.

Goldberg initially created the game as a computer programming exercise last October, and said he had not worried about copyright at the time because he did not think the game would become popular enough for that to become an issue.