With its popularity on the UCB servers, "Rogue" was selected as one of the game titles included in the 1983 distribution of 4.2 BSD, which spread across ARPANET and quickly gained popularity among colleges and facilities with access to this hardware. Among its fans included UNIX's co-developer Ken Thompson working at Bell Labs; Dennis Ritchie had joked at the time that "Rogue" was "the biggest waste of CPU cycles in history". "Rogue"s distribution in 4.2 BSD did not include its source code, so after Toy and Arnold separately left UCB, they took the code with them, making it difficult for anyone to build off it. "Rogue" source was eventually added under a BSD software license within 4.3 BSD in 1986, putting it into the open source.