The Multipleximus Maximus is a dungeon maze found at Villa Priores in Dragon Quest VII.
The Hero and Party arrive here due to having obtained the Multipleximus key to obtain the stolen Cirrus surplice.
As with the Villa Priores layout, the dungeon is a 3D maze that requires traveling each part carefully to find the right portal. Additionally to reach a different part, there are tunnels for The Party to leap down.
Additionally, this and a similar area in the Cathedral of Blight are the only areas that like the ocean still consist of random monster encounters. in the Nintendo 3DS Version.