The Track Mappers are a team within the MEG whose mission is to conduct in depth exploration of newly discovered levels. Expert explorers and survivors without equal, they catalog the entities, resources, and dangers in areas where humans have not yet established a foothold. Inside you will find information on Level 3-99 as well as four enigmatic levels from the wiki site and four original levels. This book also contains additional information to help a game master run a Caught in the Backrooms campaign.