At age fifteen, Halliday created his first videogame, Anorak’s Quest. He programmed it in BASIC on a TRS-80 Color Computer he’d received the previous Christmas (though he’d asked his parents for the slightly more expensive Commodore 64). Anorak’s Quest was an adventure game set in Chthonia, the fantasy world Halliday had created for his high-school Dungeons & Dragons campaign. "Anorak" was a nickname Halliday had been given by a female British exchange student at his high school. He liked the name Anorak so much that he’d used it for his favorite D&D character, the powerful wizard who later appeared in many of his videogames.