Project Eden is a 2001 action-adventure video game developed by Core Design and published by Eidos Interactive. It was released for Microsoft Windows and PlayStation 2. The planned Dreamcast version was cancelled. The development took approximately 4 years, the team having previously worked on Tomb Raider II. The plot involves a squad of four law enforcement agents investigating the disappearances of people by working their way downwards through layers of a towering mega-city. Project Eden's gameplay emphasises puzzle-solving, requiring the player or players to control each of the four characters and use their individual abilities to make progress. A single player can control any one of the characters, and jump between them at will or up to four players can play simultaneously as different members of the team.