[[quoteright:264:http://static.tvtropes.org/pmwiki/pub/images/underground_level.png]]
[[caption-width-right:264:[[VideoGame/HotelMario "Gee... it's kinda dark."]] [[labelnote:Games]]Clockwise from top left: ''VideoGame/SuperMarioBros1'' (''All-Stars'' release), ''VideoGame/DonkeyKongCountry'', ''VideoGame/TheLostVikings'', ''VideoGame/SuperMetroid'', ''VideoGame/KirbySuperStar'', ''VideoGame/{{Plok}}''.[[/labelnote]]]]

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 InsurmountableWaistHighFence.

Visitors may encounter BottomlessPits, falling rocks, stalactites, breakable walls, [[FungusHumongous giant mushrooms]], [[LethalLavaLand lava]], an [[UnderTheSea underground lake]], and/or [[MinecartMadness minecarts]]. GoddamnedBats abound, and watch out for the [[UndergroundMonkey monkeys]]. Visitors will probably ''not'' encounter stalag''mites'', because game designers prefer flat, uninterrupted floors for the characters and enemies to walk along (though stalagmites may show up from time to time as the cavernous version of SpikesOfDoom). The music often gets more low-key and adds drums and bass.

In most cases, light is strangely never a problem -- it might be darker than usual, but you've [[HollywoodDarkness always got enough to see by]] (maybe there's some sort of [[BioluminescenceIsCool glowing fungus]]). Oddly enough, although spiders are common, {{Cobweb Jungle}}s are not.

An extremely common variant is the crystal cave, featuring quartz and precious gems gleaming wall-to-wall with AllNaturalGemPolish. No one ever considers mining them out, because they're just there to look [[RuleOfCool cool]]. And wouldn't you know it, sometimes the crystals are [[SlippySlideyIceWorld ice crystals]].

The RPG version is usually either a fairly difficult dungeon with little reprieve, or the [[NoobCave very first one]], used as an introduction.

May at times overlap with the AbsurdlySpaciousSewer or BlackoutBasement. If there are people living there, see UndergroundCity and BeneathTheEarth.
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!!Examples:

%%Please sort this by genre
* The first two ''VideoGame/{{Avernum}}'' computer games take place entirely underground, and there are underground parts in all the others.
* Glitter Gulch Mine from ''[[VideoGame/{{Banjo-Kazooie}} Banjo-Tooie]]''.
* Several of the {{Recurring Location}}s in the Franchise/{{Castlevania}} series, such as the aptly named Underground Caverns, Abandoned Mines, and Catacombs, are this. This makes it all the more confusing in [[spoiler:the latter half of]] ''[[VideoGame/CastlevaniaSymphonyOfTheNight Castlevania: Symphony of the Night]]'' [[spoiler:where all three of these levels are the highest points in the game, yet retain the attributes of an Underground Level.]]
* ''VideoGame/CaveStory''. The only thing that's not underground is the surface right before the [[FinalBoss final]] [[BossRush boss]]. However, while that's the official setting, only a few levels look like actual caves; there's a desert level, a grassy outdoorsy level, some techie levels, an a plantation level, among others (most of which have a rocky background). Conversely, The Outer Wall appears to be outside the caves, although it's always night there, whereas it's daytime up on the balcony.
* ''VideoGame/CrystalCaves'' takes place entirely underground, but this is one case where someone is there to mine it out.
* Chimp Caverns from ''VideoGame/DonkeyKongCountry'', with various other areas also qualifying.
** Occasionally subverts the "there's always" light, with levels that require you to free a parrot to carry a lantern for you, giving you an annoying flashlight-style lit area. Other stages are lit by torch light and thus have normal lighting.
** ''VideoGame/DonkeyKongCountry 2'' improves on this with its mine shaft stages (Namely Kannon's Klaim), whose awesome music and level design make it the [[Awesome/VideoGameLevels Crowning Levels Of Awesome]]. It also features giant ice caverns found for the first time in the penultimate world, featuring appropriately echoing and cool-sounding music.
** ''VideoGame/DonkeyKongCountry 3'', however, took a bit of a step backwards, with more generic cave levels taking the stage. The music did sound pretty nice though, whether you went with the SNES or GBA versions.
* The ''VideoGame/EccoTheDolphin'' games manage to cross this level with UnderTheSea several times. At one point the severely reduced visibility is actually acknowledged, and the use of Ecco's sonar is required to get through.
* ''VideoGame/FinalFantasyVI'' has the optional dungeon of The Ancient Castle, which can only be accessed through the tunneling castle, Figaro.
* ''VideoGame/FinalFantasyVII'' has the Mithril Mines, with glowing green rocks.
* ''VideoGame/FinalFantasyIX'' has the Ice Cavern, Fossil Roo, and Gargan Roo.
* ''VideoGame/FinalFantasyXI'' has quite a few areas like this: Gustav Tunnel, Kuftal Tunnel, Korroloka Tunnel, Sea Serpent Grotto, Ordelle's Caves, and Aydeewa Subterrane. And yes, there does seem to be glowing fungi in that last one.
* ''VideoGame/FinalFantasyXII'' has a bunch of these, including the Lhusu mines, Barheim Passage, the Henne Mines, the Sochen Cave Palace, and Zertinan Caverns. One may or may not also include Giruvegan, as the paths and platforms are man-made.
* ''VideoGame/FinalFantasyXIII'' had the Mah'habara Subterra, a network of tunnels dug for whatever reason by the fal'Cie Atomos under the Gran Pulse.
* The Underworld in ''VideoGame/KingdomHeartsII'' is [[HailfirePeaks half this and half]] BigBoosHaunt.
* Dodongo's Cavern, Beneath the Well, and the Fire and Shadow Temples from ''[[VideoGame/TheLegendOfZeldaOcarinaOfTime The Legend of Zelda: Ocarina of Time]]''.
* The various Mario levels and bonuses reached by warp pipes. World 1-2 of ''Franchise/SuperMarioBros.'' is the iconic example.
** The 3D Mario games have Hazy Maze Cave from ''VideoGame/SuperMario64'', and "Spin-Dig Galaxy" and "Slimy Springs Galaxy" from ''VideoGame/SuperMarioGalaxy2''.
** World 2 of ''VideoGame/MarioAdventure'' is a combination of this and LethalLavaLand.
* Brinstar, the beginning cave area from many ''Franchise/{{Metroid}}'' games.
** Most of the first ''[[VideoGame/{{Metroid 1}} Metroid]]'' game is divided between Brinstar (caves) and Norfair ([[LethalLavaLand lava caves]]). It's also the purest example in the series, in that aside from the opening screen and the ending screen, nothing takes place above ground.
** Later games mix things up with Marida ([[DownTheDrain flooded caves]]), Phendrana Drifts ([[SlippySlideyIceWorld frozen caves]]), and the Phazon Mines ([[GreenRocks irradiated caves]]).
** ''Metroid'' tends to be either underground or in a space station, aside from some of the areas in the ''VideoGame/MetroidPrime'' series. Almost the entirety of both ''VideoGame/SuperMetroid'' and ''VideoGame/MetroidZeroMission'' (remake of the first game, which lacked the outside part of ''Super'') are underground in Zebes.
* Combining a [[Franchise/SuperMarioBros Franchise whose Underground Levels have a]] [[EarWorm Memetic Ear Worm for music]] [[XMeetsY with a]] [[EasternRPG genre]] famous for using underground levels [[ChokepointGeography of a different sort]]? Of course you'll find Underground Levels in those spinoffs:
** Mole Mines in ''VideoGame/SuperMarioRPG: Legend of the Seven Stars'', complete with {{Minecart|Madness}}-riding minigame.
** The area beneath Rogueport in ''VideoGame/PaperMarioTheThousandYearDoor'' is fairly extensive, but it also overlaps with HubLevel and AbsurdlySpaciousSewer, as it's the ruins of the original Rogueport.
** ''VideoGame/SuperPaperMario'' has the Floro Caverns.
* Too many in the ''Franchise/{{Pokemon}}'' games to name them all- each mainline game seems to feature at least 3, [[HailfirePeaks at least one]] is an [[SlippySlideyIceWorld ice cave]], and another one is pitch black and requires the Flash power to navigate with any accuracy. Victory Road is always among them, however.
** ''[[VideoGame/PokemonDiamondAndPearl Diamond, Pearl, and Platinum]]'' have a set of underground passages filled with treasure that spans the '''entire region'''
** Relic Passage in ''VideoGame/PokemonBlack2AndWhite2'' is also notable. It connects Driftveil City to Castelia's sewers, Desert Resort (it's the only way into the Relic Castle then) and Twist Mountain. It lets you ride mining carts in some tunnels and also contains the chamber with the three Golems from [[VideoGame/PokemonRubyAndSapphire Gen III]], though you need the key from the opposite game for the final Golem. The biggest annoyance aside from how easy it is to get lost is that some areas have higher-level Boldore that have access to Explode.
** Terminus Cave in ''VideoGame/PokemonXAndY'', home of [[OlympusMons Zygarde]]
** As for the console games, ''VideoGame/PokemonColosseum'' has the Under, a former mine where many of Pyrite Town's residents fled to after the town's normal state of semi-lawlessness escalated to chaos due to Team Cipher coming to town. It's closed off in ''PokemonXD'' to keep any other criminal activity from going on in it.
* This is practically the entirety of the ''VideoGame/PokemonMysteryDungeon'' games, and all the other ''[[{{Roguelike}} FushigiNoDungeon]]'' games, for that matter. You do have some areas that take place aboveground, but all the main action happens in underground caverns, hence the 'dungeon' title.
* Mystic Cave Zone from ''VideoGame/SonicTheHedgehog2''.
** Aquatic Mine from ''VideoGame/SonicAdventure2''.
** Skeleton Dome from ''Sonic and the Secret Rings''.
** Coral Cave in ''Sonic Rush Adventure'', [[HailfirePeaks mixing it up with]] UnderTheSea. And it's very pretty.
** In ''VideoGame/SonicAdventure'', most of Ice Cap before the snowboarding portion, and the second part of Sonic's version of Red Mountain (the whole level, for Gamma).
** Crystal Cave from ''Sonic and the Black Knight''.
** Underground Zone and Gimmick Mountain from ''VideoGame/SonicTheHedgehog2'' 8-bit.
** The second half of Flame Core in ''VideoGame/SonicTheHedgehog2006'', similar style to Red Mountain, and also Lava Reef from Sonic and Knuckles. And the 2P level Endless Mine in ''Sonic 3''.
** Quartz Quadrant in ''SonicCD''
* In ''VideoGame/StarFoxAdventures'', once the speeder bike in the Darkice Mines passes a certain point, the rest of the level is cave.
* The original ''[[VideoGame/StarFox1 Star Fox]]'' even had one of these in the planet Macbeth- explained away as a planet where the core shrunk due to strange experiments by [[MadScientist Andross]].
* As with the aforementioned source material, ''Videogame/TheFellowshipOfTheRing'' has the Mines of Moria, which are [[DisappointingLastLevel extremely long]].
* ''YoungMerlin'' has a cave system with mine carts. There are passages everywhere between various cave entrances--you just step in the entrance and get transported to a different cave entrance somewhere else. Unless you step into the cave entrance and get killed by a bunch of creatures with evil eyes (the only thing you ever see).
* The Hollow from ''VideoGame/PrimalRage''.
* The entirety of the first two ''{{Descent}}'' games, sometimes crossing into LethalLavaLand. [[JustifiedTrope Justified]] in that you're flying through mines to clear out berserk mining robots.
* The final levels of ''VideoGame/{{Plok}}'' (pictured above, middle-left) take place in the Flea Pit.
* Virtually every ''VideoGame/{{Kirby}}'' game has one.
** ''The Great Cave Offensive'' in ''VideoGame/KirbySuperStar'' and its UpdatedRerelease is a {{Metroidvania}} subgame that takes place entirely in an underground cavern, which is apparently large enough to have its own atmosphere and clouds floating around in places.
* ''VideoGame/{{World of Warcraft}}'' has several although Ahn'Kahet qualifies the best. It is an underground city that here and there borders natural subterranean life. It features large, glowy mushrooms, insects of different types and sizes and bioluminiscent birds/bats that fly around. It also contains large number of undead that took over the city as well as the few surviving Nerubians that orginally inhabited the city. While the dungeon itself is fairly linear, players are able get a good view of the massive underground caverns from ledges and combinations of creepy music, darkness and mysterious whispers (courtesy of an [[EldritchAbomination Old God]] under whose range of influence the city is located) make this place quite {{Nightmare Fuel}}lerific. It was originally meant to be part of a whole underground region.
* ''VideoGame/DragonAgeOrigins'' has the Deep Roads, which contain equal amounts of caverns and ruined dwarf strongholds. Also ThatOneLevel for many players, though the abundance of great loot (two of the best sets of armor in the game, and several top-quality weapons, can be found down there) can help make up for it.
* The first ''VideoGame/UltimaUnderworld'' game in its entirety.
* The entire setting of ''VideoGame/ManicMiner'' ([[CaptainObvious duh]]).
* The "Melon Mines" level of ''[[VideoGame/CommanderKeen Keen Dreams]]'' and the cave levels of [=CK4=].
* All of ''VideoGame/{{Touhou}} Project: Subterranean Animism'' is like this as the plot requires the characters to investigate a disturbance coming from the underground. [[spoiler:Except the extra stage, which revisits a location from the previous game. [[note]]The Moriya Shrine. Which also happens to be the location of the previous game's extra stage.[[/note]]]]
* Sector 5 of ''VideoGame/{{Jumper}} Two'' is an underground cave which Ogmo fell into ''while asleep''.
* ''{{VideoGame/Turok}} 2: Seeds of Evil'': The Lair of the Blind Ones.
* The Old Underground Metro Area, a forgotten city district engulfed by an earthquake and used as a base for the new city, in ''[[FirstEncounterAssaultRecon F.E.A.R. Perseus Mandate]]''. There aren't any human enemies in the two levels it spans, [[ThingsThatGoBumpInTheNight which doesn't make them any less terrifying]]. In fact, the sheer amount of hostile apparitions probably makes the place the games' very first BigBoosHaunt.
* This is arguably the most common type of dungeon in Franchise/TheElderScrolls.
* The first and second chapters of the Hordes of the Underdark expansion for NeverwinterNights are (except for the very start) spent underground.
* ''LEGORockRaiders''. ''The entire game'' is an UndergroundLevel.
* Huge chunks of the ''VideoGame/GearsOfWar'' franchise.
* Any of the caves in ''VideoGame/{{Minecraft}}'' and ''VideoGame/{{Terraria}}''.
* The Catacombs and [[BlackoutBasement Tomb of the Giants]] in ''VideoGame/DarkSouls''.
* The ''VideoGame/{{Fallout}}'' series has featured underground areas from the beginning, ranging from the buried Vaults and their entrance tunnels to mines and abandoned subways.
* ''VideoGame/ArcanumOfSteamworksAndMagickObscura'' has a number of mines and underground cities to explore, usually infested with [[BreakableWeapons weapon-eating]] golems and corrisive blobs.
* ''VideoGame/{{Athena}}'' has World of Cavern as the second level.
* The ancient [[AbsentAliens Vanu]] caverns in ''PlanetSide''. Megalithic rock formations, giant crystals composed of [[NanoTechnology nanites]], multiple vertical levels, zip-lines, and abandoned ([[RagnarokProofing but totally functional]]) Vanu buildings.
* SuperMarioFusionRevival:
** World 3-1: Viscous Burrow. The first area our heroes encounter in the Ocean of Oblivion is a burrow inhabited by giant maggots. This area is flooded by caustic purple fluid and at times, the only way to traverse the caustic pools is to use the slime trails produced by the maggots.
** World 4-5 (Crimson Cavern): A maze level that switches between a blood-filled and a lava-filled version of the same cavern, with some minor differences.
* Stage 5 (Maclonna Mine) in ''VideoGame/MoonCrystal''.
* ''VideoGame/PsychoFox'' has two: Stage 5 (Underground Passageway) and Stage 7 (Underground Cavern).
* ''VideoGame/ProjectEden'' is almost entirely set underground. This being a scifi game, underground means "abandoned and decaying ruins of the megacity that now spans above" rather than "damp caves". Occasionally overlaps with BeneathTheEarth, as a few game areas are inhabited by neutral [=NPCs=].
* In ''VideoGame/SlySpy'', the sixth level is in a cavern leading to an underground hideout.
* The first ''VideoGame/{{Shantae}}'' game has the Golem Mine, which has lava, stalactites, and stalagmites blocking Shantae's path and puzzles involving the usage of polarities to attract and repel objects.
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