A man serving life in prison for first-degree intentional homicide lost his legal battle Monday to play Dungeons & Dragons behind bars.

Kevin T. Singer filed a federal lawsuit against officials at Wisconsin's Waupun prison, arguing that a policy banning all Dungeons & Dragons material violated his free speech and due process rights.

Prison officials instigated the Dungeons & Dragons ban among concerns that playing the game promoted gang-related activity and was a threat to security. Singer challenged the ban but the 7th U.S. Circuit Court of Appeals on Monday upheld it as a reasonable policy.

Dungeons & Dragons players create fictional characters and carry out their adventures, often working together as a group, with the help of complicated rules.

Singer, 33, has been a devoted player of the fantasy role-playing game since he was a child, according to the court ruling. After the ban went into effect, prison officials confiscated dozens of Dungeons & Dragons books and magazines in his cell as well as a 96-page manuscript he had written detailing a potential scenario for the game that players could act out.