Memento Mori is a 32-level vanilla megawad designed by two members of the Innocent Crew, Denis and Thomas Möller, along with 19 other authors, including Tom Mustaine and both Dario and Milo Casali. It is designed especially for cooperative multiplayer gameplay, although it can be played in single-player as well.

The music is an original soundtrack composed by Mark Klem, who also designed one level and co-designed another.