Teamnesia is a community-wide effort that focuses on bringing players the very best work that the Amnesia: The Dark Descent modding community has to offer. It will be a free-roam map with a Super Mario-esque taste -- You can enter whichever map you please, each being made by a different member of the FricGames mod community. This provides a unique and ever-changing experience for both the players and the designers; those who participate and contribute their work to the project are given free reign and encouraged to be creative and produce something extraordinary and outstanding. Head over to the Teamnesia: A community-wide effort thread at the Frictional Games Showcase forum to submit your map to the project or to keep track of the progress and get updates on release notes or even sneak peeks!
A cool teaser screenshot from Acies' map The Library of Alexandria.