The Demon Realm
World 4

Universe(s) Represented DOOM series
Ghosts 'n Goblins series
Castlevania series

Number of Levels 8 normal
7 secret
3 fortresses
1 world boss level

Coin Skin Skull Coins

World Boss Loki

The Demon Realm is the fourth world in Mushroom Kingdom Fusion. It is Arthur's home world and features levels based on the Doom, Castlevania, and Ghouls 'n Ghosts series, as well as other sinister and horror themed games. The World Boss is Loki. The world will eventually be expanded at one point.


This world features dark-themed levels. There are some Satanic references in some levels.


Total number of levels: 19

  • Normal Levels: 8
  • Secret Levels: 7
  • Fortresses: 3
  • World Boss: 1


Normal Levels

Secret Levels

Worlds in Mushroom Kingdom Fusion
World 1 | World 2 | World 3 | World 4 | World 5 | World 6 | World 7 | World 8 | World 9 | World 0 | World -1

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