In the first few years of the Hunt, gunters had swarmed like hungry insects to any OASIS location that seemed like a possible hiding place for the three keys, specifically planets originally coded by Halliday himself. Chief among these was the planet Chthonia, a painstaking re-creation of the fantasy world Halliday had created for his high-school Dungeons & Dragons campaign, and also the setting of many of his early videogames. Chthonia had become the gunters’ Mecca. Like everyone else, I’d felt obligated to make a pilgrimage there, to visit Castle Anorak. But the castle was impregnable and always had been. No avatar but Anorak himself had ever been able to pass through its entrance.