* The plaques that can be occasionally found on the walls contain [[Secrets#Skull Cavern Plaques|enciphered messages]].
* The plaques that can be occasionally found on the walls contain [[Secrets#Skull Cavern Plaques|enciphered messages]].
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* To reach the [[#cite_note-integerlimit-1|integer limit]], it would be required to bypass Floor 77377 of the Skull Cavern as that is the location of the [[Quarry Mine]].<ref name="quarryMineShaft" />
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* To reach the [[#cite_note-integerlimit-1|integer limit]], it would be required to bypass the [[Quarry Mine]] Floor, which has no ability to produce a ladder. (This floor is coded as 77377, and can be found at level 77257 of the Skull Cavern, which counts floor 1 as floor 121 internally.) <ref name="quarryMineShaft" />
* Starting at floor 880, iridium bats will become red bats and have double health and faster speed.<ref name="deepbats" />
* Starting at floor 880, iridium bats will become red bats and have double health and faster speed.<ref name="deepbats" />