Memento Mori

Memento Mori is a 1995 megawad that contains 32 new levels, 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. In contrast to most megawads, it is designed especially for cooperative multiplayer gameplay, although it can be played in single-player as well. It is also one of the few PWADs that are allowed to be used in Compet-N speedruns. The soundtrack was composed by Mark Klem, who also designed one level and co-designed another.

A sequel, Memento Mori II, was later developed and released a year later.

Levels
First "episode": Second "episode": Third "episode": Final "episode": Secret levels:
 * MAP01: The Teleporter by Michiel Rutting and Denis Möller
 * MAP02: The Bridge by David Davidson
 * MAP03: Interlock by Tom Mustaine
 * MAP04: The Stand by Jens Nielsen
 * MAP05: Hell's Kitchen by Orin Flaharty
 * MAP06: The Powerstation by Eric Sargent and Mark Klem
 * MAP07: Not That Simple by Jens Nielsen
 * MAP08: And the Dead Shall Rise by Orin Flaharty
 * MAP09: High-Tech Grave by Thomas Möller
 * MAP10: The Mansion by Alden Bates
 * MAP11: Halls of Insanity by Eric Reuter and Denis Möller
 * MAP12: Kinetics by Mackey "Avatar" McCandlish
 * MAP13: The Inmost Dens II by Denis Möller
 * MAP14: Aquaduct by Tom Mustaine
 * MAP15: Karmacoma by Florian Helmberger
 * MAP16: Stoned by Kurt Schmid
 * MAP17: House of Thorn by Eric Sambach
 * MAP18: A Dead Man's Town by Henrik Rathje
 * MAP19: Maltraiter by Michael Rapp
 * MAP20: Mountain Depot by Scott Lampert
 * MAP21: Twilight Lab by Andy Badorek
 * MAP22: The Escape by Denis Möller
 * MAP23: Showdown by Milo Casali
 * MAP24: Diehard by Dario Casali
 * MAP25: Cesspool by William Sullivan
 * MAP26: Between Scattered Corpses by Thomas and Denis Möller
 * MAP27: Fort Hades by Scott Lampert
 * MAP28: City of the Unavenged by Jens Nielsen
 * MAP29: Island of Death by Thomas Möller
 * MAP30: Viper by Milo Casali
 * MAP31: Technology Base by Denis Möller
 * MAP32: The Hidden Slime Factory by Mark Klem