A planet named Gygax in Sector Two seemed like the obvious place to start looking. Halliday had coded the planet himself, and he’d named it after Gary Gygax, one of the creators of Dungeons & Dragons and the author of the original Tomb of Horrors module. According to Gunterpedia (a gunter wiki), the planet Gygax was covered with re-creations of old D&D modules, but Tomb of Horrors was not one of them. There didn’t appear to be a re-creation of the tomb on any of the other D&D-themed worlds in the OASIS either. Gunters had turned all of those planets upside down and scoured every square inch of their surfaces. Had a re-creation of the Tomb of Horrors been hidden on one of them, it would have been found and logged long ago.