Underground levels, carved out of endless expanses of rock, are among the favorites of video game designers, primarily because they can shape these tunnels and cavities to any sizes, shapes and lengths they desire without having to resort to the Insurmountable Waist High Fence.
Visitors may encounter Bottomless Pits, falling rocks, stalactites, breakable walls, giant mushrooms, lava, an [...] [tvtropes.org]