MAP31: Technology Base is the secret map of Memento Mori and can be accessed from MAP15: Karmacoma. It was designed by Denis Möller and uses the music track "Slipper" by Mark Klem. The level is designed to place Players 1 and 3, and 2 and 4 on separate halves of the level in cooperative multiplayer, with both teams meeting only after a certain wall is lowered at a rendezvous point, rendering half of the level normally inaccessible in single-player gameplay. However, due to a design flaw, the player can enter the "inaccessible" half of the level in single-player, and consequently, Players 1 and 3 can cross over into Players 2 and 4's side early (see Routes and tricks.)