Underwhere river twyx

Mario crossing the river Twygz.

The Underwhere is a place in Super Paper Mario where people go when their games are over. It resembles an underworld and may be particularly based on the Greek underworld, as the Underwhere has a place known as the River Twygz, based on the River Styx. Like the River Styx, the River Twygz is teeming with corpses and other undead spirits.