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Hearts of Darkness (Merciless) is a secret stage in Growing Strange. It can be accessed randomly after completing An Elder Secret (Merciless). Completing this stage yields an Elder Catfruit Seed, with a very small chance of an Elder Catfruit.

Battleground

  • At the beginning, a Dark Otter and a Tackey will spawn. Nothing else will spawn until you hit the enemy base.
  • When the enemy base reaches 99% HP, the base will spawn up to 2 Doge Darks, 3 Tackeys, 11 S.B.Ks, 5 Dark Otters and 1 Razorback. Once they are killed, nothing else will spawn.

Strategy

If you plan on completing this stage whenever it comes up, you need to have Bombercat, Rodeo Cat or something similar in the lineup; that, and someone good forcrowd controll or damage are all that's needed specifically for this stage; as for the Tackeys, you can either lure everyone else close to your base by isolating your first bunch of units, stall them near the base while the Tackeys approach and then kill Razorback ASAP or you can use the lenght of the stage to "tank" the pushback caused by tackey and kill Razorback afterwards.

Once Razorback is dead, you have basically won.

Reference

Special Stages
Daily Stages
Normal Stages Monday Stage (Rich Cat) • Tuesday Stage (Speed Cat) • Wednesday Stage (Cat Jobs) • Thursday Stage (Sniper Cat) • Friday Stage (Helpful Cat) • Weekend Stage
Blitz. Stages Monday Stage (Hard+)Tuesday Stage (Hard+)Wednesday Stage (Hard+)Thursday Stage (Hard+)Friday Stage (Hard+)
Guerrilla Stages
Cat Ticket Guerrilla Love, Metal Hippoe (Hard)Siege of Hippoe (Hard++)Steel Visage (Deadly)
XP Guerrilla XP StagesXP MegablitzXP ColosseumMerciless XP!
Catfruit Guerrilla Growing Green (IIIIII) • Growing Purple (IIIIII) • Growing Red (IIIIII) • Growing Blue (IIIIII) • Growing Yellow (IIIIII) • Growing Strange ( RedFloatingBlackAngelAlienMetalZombie) • Catfruit JubileeCatfruit Buffet
Material Guerrilla Cavern of Comets (IIIIII) • Island of Ash (IIIIII) • Strait of Wings (IIIIII)
Cyclone Stages
Daily Attack on R-Cyclone (Expert)Attack on B-Cyclone (Expert)Attack on W-Cyclone (Expert)
Oncoming Maelstrom (Expert)Attack on Titanium (Insane)Black Hole Rising (Insane)
Oncoming Storm (Insane)Unholy Tempest (Insane)The Wormhole Opens (Deadly)
Advanced Bad to Worse (Tragedy in Red (Insane)Doom Paradise (Insane))
Day of Judgement (Explosion in the Sky (Insane)Acts of Cat-God (Insane))
Techneurosis (Nuts 'n' Bolts (Insane)Space is the Place (Insane))
Crazed Cat Stages
Crazed Cats Dark Souls (Insane)Absolute Defense (Insane)Berserk (Insane)
Festival Gross (Insane)Head Shaker (Insane)Flappy Cat (Insane)
Fish Hell (Insane)Mammals? (Insane)Crazy Cats (Insane)
Manic Cats Deathhawk (Deadly)Vulcanizer (Deadly)Unjust War (Deadly)
Muscle Party (Deadly)Lots O' Lion (Deadly)Forest Beasts (Deadly)
Ogre Island (Deadly)Draconian (Deadly)Resident Feline (Deadly)
Awakening Stages
Buyable Cats Actress AwakensKung Fu AwakensMr. AwakensBondage AwakensDom Awakens
Box Cats AwakensPanties AwakensTricycle AwakensNinja AwakensZombie Awakens
Samurai AwakensSumo AwakensBoogie AwakensSkirt Awakens
Monthly Cats Adult AwakensEvil AwakensDoll AwakensMaiden Awakens
Koi AwakensBride AwakensVacation AwakensVengeance Awakens
Kung Fu X AwakensSports Day AwakensSalaryman AwakensReindeer Fish Awakens
Li'l Cats Tiny Meows (Deadly)Tiny Will (Deadly)Tiny Chopper (Deadly)
Tiny Creeper (Deadly)Tiny Horns (Deadly)Tiny Wings (Deadly)
Tiny Fins (Deadly)Tiny Tail (Deadly)Tiny Fists (Deadly)
Other Cats Kart AwakensFlower Awakens
Monthly Event All-Stars Stages
Special Thanks! (Insane)Ultra Stress! (Insane)Miracle Tactics! (Insane)Wonderful Conquest (Insane)Elite Corps (Insane)Megaton Blast (Insane)
Memorial Stages
Year's First Dawn • Happy Birthday (IIIIII) • 3rd Anniversary Birthday Presents20 Million Downloads Special Gift!Sender Unknown
Region Restriction
Korean Version ☆ Special StageTaiwan Version Special StageFaster Than Fast FoodWe're Number One
Unknown Schedule
Dark Descent I: Eastern Cave • II: Western Walk • III: Southern Fort • ∞: Northern Crater
Deadly Carnival Tornado Carnival (Deadly)Awakened Carnival (Deadly)
Deadly Carnival II Tornado Carnival II (Deadly)Awakened Carnival II (Deadly)
Other Deadly Stages No Plan A (Deadly)Realm of Carnage (Deadly)Honey Trap (Deadly)Parade of the Dead (Deadly)N-1 Grand Prix (Deadly)
Heavenly Tower Floor 1Floor 2Floor 3Floor 4Floor 5Floor 6Floor 7Floor 8Floor 9Floor 10

Floor 11Floor 12Floor 13Floor 14Floor 15Floor 16Floor 17Floor 18Floor 19Floor 20
Floor 21Floor 22Floor 23Floor 24Floor 25Floor 26Floor 27Floor 28Floor 29Floor 30
Floor 31Floor 32Floor 33Floor 34Floor 35Floor 36Floor 37Floor 38Floor 39Floor 40

Other Special Stages
The Battle Cats POP! Poppin' in 3D!Fight your Friends!Player VS PlayerPay Only Once!No I-A-P!Get Those UbersConquer the GalaxyAt Nintendo eShop!
BitSummitBCJP Only Held in Miyako Messe! 2016Held in Miyako Messe! 2017