View source for Levels with an underground/cave theme

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|:Category:Levels with an underground/cave theme  |l2=Underground/cave theme }}
[[Image:S3K_HPZ.PNG|frame|right|[[Hidden Palace Zone (S&K)|Hidden Palace Zone]] from ''[[Sonic & Knuckles]]'' is an example of the underground/cave theme]]
Levels with the '''[[:Category:Levels with an underground/cave theme|underground/cave theme]]''' often take place in underground caverns, with lava, sewage, and sometimes [[Chaos Emeralds]].  This theme first appeared in [[Labyrinth Zone]] in ''[[Sonic the Hedgehog (16-bit)|Sonic the Hedgehog]]''.

In this darker underground environment, the player may encounter the [[Flasher]], [[Rexxon]], or [[Iwamodoki]].  Notably, [[Hidden Palace Zone (S&K)|Hidden Palace Zone]] of ''[[Sonic & Knuckles]]'' and the scrapped [[Hidden Palace Zone]] of ''[[Sonic the Hedgehog 2 (16-bit)|Sonic the Hedgehog 2]]'' (both levels designed to be a key part of the story) both incorporate the underground/cave theme into their designs.
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==Levels with an underground/cave theme==
{{LevelGallery|Levels with an underground/cave theme}}
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[[Category:Level themes]]