This level is located in the Dungeons of Doom between 1 and 4 levels above the Castle (and therefore between DL 21 and DL 28).
Medusa's Island is ineligible to leave bones files. The entire level is no-teleport. Monster creation on this level is biased towards chaotic monsters.
Medusa's island comes in two versions, each of which has a 50% chance of being used.
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Medusa is waiting on the downstair; there is a random S in each of the top and bottom corridors of her hall, two water trolls in the water to the right of the level, three giant eels and three jellyfish in the water to the left of the level, and ten random other monsters. In addition to the two marked squeaky boards, there are five other random traps on the level.
The statue of Perseus on the downstair has (independently) a 75% chance of containing a cursed +0 shield of reflection, a 25% chance of +0 levitation boots, a 50% chance of a blessed +2 scimitar, and a 50% chance of a sack; up to five other statues of player-monsters with names and classes from the top ten score list may be randomly created in Medusa's chamber, and will be empty. The seven random other statues around the level will contain any equipment their monster type might usually be issued with, but will not have the usual chance of containing a random spellbook.
The walls of Medusa's hall are undiggable.
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Medusa is waiting on the downstair; there is a titan and a gremlin in the entrance hall, six electric eels and three jellyfish in the water to the left of the level, four stone golems and two cobras immediately outside Medusa's room, a random A and a yellow light in the back room of Medusa's hall, and a further thirteen random monsters distributed fairly evenly across the level. In addition to the marked magic trap, there are four other random traps on the level.
The statue of Perseus on the downstair has (independently) a 25% chance of containing a cursed +0 shield of reflection, a 75% chance of +0 levitation boots, a 50% chance of a blessed +2 scimitar, and a 50% chance of a sack; up to five other statues of player-monsters with names and classes from the top ten score list may be randomly created in Medusa's hall, and will be empty. The eight marked statues outside Medusa's room will contain any equipment their monster type might usually be issued with, but will not have the usual chance of containing a random spellbook.
There are marked boulders in the entrance hall and on the right-hand island; the latter has a random wand beneath it. The walls of both the entrance hall and Medusa's hall are undiggable.