I frantically searched my favorite warez sites until I found a high-end image-recognition plug-in for the OASIS atlas. Once I downloaded the software via Guntorrent, it took me a few more minutes to figure out how to make it scan the entire surface of Ludus for a hill with large black stones arranged in a skull-like pattern. One with a size, shape, and appearance that matched the illustration from the Tomb of Horrors module.