Underground is the last stage in Stairway to Darkness, sub-chapter 21.


  • This stage has 3 out of the 4 'normal' Bun Buns sent out; White, Red, and Black. With their fast attack rate, they can break through the player's defense easily.
  • Long distance between castles (5200/3600), if the players spawn too much defense Cat Units, Not enough space to produce will occur.
  • Note that if you sync the Bun Buns, the battle will become much easier. However, due to varied health and knockbacks, it is easy for them to get knocked back and will then proceed to plow your front line. Area cats such as Urunun Cat can knockback the Bun Buns back together, so that they are synced to make the battle easier.


Above all, DO NOT CONFIDE IN Necro-Dancer or any other single-target debuffs. They will likely hit the Hippoes instead and by the time any Bahamuts or ubers have taken care of the hippoes, the line would be pushed, and they would be dead.

Rather try units like Delinquent or Bodhisattva who has area attacks (Can hit through the hippoes).

Strategy 1

Strategy 2

  • Cat Line Up : 4 Meatshields, Paris Cat, 2 Long-Range Dealers, Bahamut Cat, Ururun Wolf, and an anti-Floating Cat.
  • Stack up the Bahamuts and hit the base with the meatshield wave. When the Bun Buns appear, start spamming the anti-floating cats, and turn on the Cat CPU, then start producing meatshields. Cat CPU will control the Bahamut Cat and your other dealers. Don't pick many meatshields at a time, because you will likely get caught on the "Not Enough Space" warning.

It is crucial to make the Bun Buns attack at once using either Knockbacks or the Cat Cannon.

Strategy 3

  • Cat Line Up: Mohawk Cat/Crazed Cat, Eraser Cat, Jiangshi Cat/Commando Cat, Paris Cat, Crazed Sexy Legs Cat, King Dragon Cat, Crazed Dragon Cat, Holy Valkyrie Cat, Crazed Bahamut Cat, Ururun Cat.
  • Start the battle with some stalling to build up the wallet. When there are a decent number of long-ranged Cats, advance to the Enemy Base and start the boss fight.
  • Only spawn Valkyrie, Bahamut and Ururun after the Bun Bun Teachers appeared. The player will be overwhelmed by the "Not Enough Space" warning, the three latter Cats will be killed and the player soon losing ground, but the Bun Bun Teachers will die one by one with the continous wave of Paris and other ranged Cats.

Strategy 4 by Okreally

  • Cat Line Up: Gold, Mohawk, Eraser, Ring Girl, Paris, King Dragon, Vars, Crazed Bahamut, God Dragon and Holy Valkyrie.
  • Use gold, mohawk and eraser as meat shields to stave off the ginger snaches. When Shadow Boxer K appears, send out a Ring Girl Cat while continuing to use meat shields. You will need to spawn a new Ring Girl occasionally but keep close to your base for now, so don't send out more than one or two at a time.
  • When your $$ is maxed, send out Crazed Bahamut, Vars, God Dragon, Ring girl, King Dragon and Paris and let Valkyrie out when they got close to the base so she arrives at the same time. After that you can just spam all your cats.
  • I used the Iron Wall (at lvl 5) instead of regular cannon blast. I did not test this method with regular cannon. 


Walkthrough Video Player Notes
アンダーワールド 無課金攻略 にゃんこ大戦争 闇へと続く地下道

アンダーワールド 無課金攻略 にゃんこ大戦争 闇へと続く地下道

アンダーワールド 闇へと続く地下道 レジェンドストーリー にゃんこ大戦争動画

アンダーワールド 闇へと続く地下道 レジェンドストーリー にゃんこ大戦争動画.com 攻略情報 battle cats

The Battle Cats - Underground

The Battle Cats - Underground

Nurse Wuffa


Stories of Legend Stages
The Legend Begins EarthshakerReturn of TerrorSunset BluesMelancholy DampBouncy ParkGentle SmileGuardian of the RanchSleeping Lion
Passion Land NyandaluciaPaella FieldFlamenco HoleSangria RiverGazpacho HighlandChurros NightBone Dry GardensTapas Desert
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Volkanos Volcano Hot Bath RockGentle GeyserThick MagmaFire CageVolcanic DefenderFlame Caldera
Neverending Cat Story Potential RoadGloomy TreeA Song in the WindPhilosophy RoadFrontier BellRiver of TearsShining RoadThe Trial Deep
Castle of Fish The Sea WhispersRipples IslandOctopus SeaPoseidon RestMoonlight BeachCoral Coral ReefArk of the MonthKiller Sardines
Sushi Island Tuna FieldCrab FieldSalmon CaveSea Urchin CaveCaviar WoodsNatto BayHalibut ForestShrimp Frontier
The Scratching Post Cardboard CorridorCatnip DreamCrunchy WallWading WoodchipsCrunchy PillarDisapproving Giant
Parthenon Altar of ZeusSword of AchillesRoad of ErosDawn of GaiaGates of AphroditeLabyrinth of Hades
Low Tide Beach Clammy CoveBeached MammalsBikini TerritoryApple Bobbing OceanParasol FieldAncient One-PieceGlassy SandsStar Ocean
Alcatraz Gull CoastPelican IslandUnderground BaseVillains JungleChicken GameCat TrialPrison PrairieJailer in the Morgue
Jail Break Tunnel Sin and PunishmentPrison SentenceHarry TunnelDead FallsPitfall ZoneThe Great Escaper
Capone's Jail Jailbreak DiaryLast GangPrison DestructionKing of FreedomLiar's FatePigpen Taboo
Silk Road Gandara's RestUtopia is Over ThereGodiego PassMonkey MagicOutsider's GateMarco Po RoadPig SwillImp's cold sweat
Stairway to Darkness Safe and Not SorryClaustronyctophobiaRed AlertPitfalls of LifeSubtle CurfewUnderground
Prince of Darkness The Red CarpetThe BathroomThe VIP RoomTorture RoomDictator's GardenSatan's Bedroom
Dead End Night Feast of BetrayalCatharsis' EndBlack PremonitionBroken MaskAgape's CageSaint Red Fox
Battle Royale Her Highness, Milk T.Angry FightingThe Horrible SongTrap of CowardsDark NemesisScent of Gore & Fish
Scars of War Valkyrie PlainsMinefieldKugel SchreiberMuddy TrenchSniper JungleSunset SoldierFather's BackWinning Back
Sea Polluter Oil PlatformSweat and AldehydeAncient TrialI'm onto youLittering CoastBenzene FieldGovernment WatchdogRevolving-door Floats
Body & Soul Sunset's HowlGestalt, DecayWarrior's DawnCursed BlizzardsSign of the CatOut of DespairMetabolic SyndromeLove and Death
Weak & Mildly Acidic At last, I'm a CatKnights of the RoundCat CatharsisBeautiful FinaleNo More Bad DreamsLearned to Love
Intrepid Cats Renewed ConflictMysterious OrderBirdwatchingThorny DialogueDarkweb
Shadow Cosmopolis Hungry ForestOverachiever CentralMorning Rush HourDocking MassacreSubterranean StalkerLord of the Abyss
Galapa-Goth DNA & DHATwilight PoachersSurviving HerdAlien EcologyHeavenly CreaturesConservation Society
Kombu Cape Rinrin ShelterbeltIberian PlainsWeeping DunesGolden GaiLeadfoot DriveTrouble at the Mansion
Axis of Evil Pecking OrderTechnocracyMerciless OnslaughtCelestial SeasClose EncountersThe Spy Who Pet Me
Suburbs of the Dead Home Sweet MausoleumSwamp of SacrificeDungeon of DreamsRevenant RoadGhostlight GardensSilenced Meowing
Quarantine Isles Virus SmugglersBionic SeaweedAncestral WaysHigh WatchtowerTunafish TrenchesThe Infected King
Mouseyland Greeter at the GatesRickety CoasterVirtual Nightmare50 Degrees HotterIrresistable HenhouseThe Haunted 1LDK
Walk of Fame Paparazzi ParadiseGossip RagsBeverly Hills ScoopLovechild LaneSaucy ScandalsMultiversal Studios
Cutpurse Coast Swim MeetSea Breeze SalonDeep Sea DyingProcrastinator ParadeGrand ExhibitionNo Return Flights
Above & Below Electric BathBoiling SpringMineral TreatmentSoap ScumThe Sauna CrewSteamed to Death
Windless Island Narrow DocksRomantic HighwayDrunken BackrubGulag of LovePerfume RoomHouses of the Holy
IT Catacombs Caliban's KeeperDial-Up DreamsThrone of Phone0S GraveyardThe Holy ExploitBroadband Omens
Grotesque Gallery Cubist CrimesSurrealist SinsGouache GhoulsDeath by DadaBaroque BeastsAtrocious Deco
Area 22 Roswell IncidentCat AbductionAdamski TypeChupacabra LoveTunguska EventOffworld Weary
Beyond the Savannah Eat the WeakNikumanjaroThe Noble TribeDry SeasonElectrosafariHeaven's Oasis
Blizzard Boulevard Shiver JunctionLeaky TunnelFrostbite ParkToasty TurnpikeSleepy SignalsScorched Tollbooth
Singularityville Ubiquitous SalesVirtual HarvestWearable Homes8K FertilizerBlockchain TwilightHaunted Genome
Ends of the Earth Ultimate ShrineValley of the EndFinal TowerLast LabyrinthCave ConclusionApocalypse Temple
The Legend Ends A Day of ReckoningThirst for VengeanceGlory of GloriesA Moment of SerenityFalse ResurrectionGoblet of the OathTwilight ZephyrUnkept Promises
Laboratory of Relics Eldritch Forces
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