Before Dragon Cave had the user made sprites it has now, all the sprites came from various video games across the web. This led to some copyright issues, and was forced to replace them with the help of various Dragon Cave fans, resulting in the Replacement Project (also knows as "The Great Fog"). Many of the replacement sprites added were heavily influenced by the previous ones, and some artists critiqued the initial replacements as having anatomy problems, most notably the initial Gold Dragons and Two-Headed hatchlings. These critiques would later lead on to the occasional sprite updates that the Cave still sees today.