Underground Cave

Underground Cave

Bloon Encounters	Underground (Story) Spillway (Boss Battle — Bloonarius)
Loot chests	1× Bananite Chest ( 1,500) Glue Splatter Poncho
Bananite crystals	22 ( 3,300)
Campfire	No
Fishing Spot	No
Connected to	Sulfur Springs Town Sinkhole Furlong Fields

Underground Cave is an underground sub-area in the Frontier Legends DLC for Bloons TD 6. It is a large cavern located underneath Sulfur Springs filled with Bananite crystals guarded by Bloons. Bloonarius can be found in the innermost part of the cave. In the story, Sheriff, Scout, and Hazel track the Bloons to this location and find a non-natural tunnel, which makes Sheriff worry and decides to go back to Sandytown to inform Mr Mayor about their findings.

Bloon Encounters

Underground

Encounter

Map: Underground
Type: Story
Roundset: Type 1

Modifiers

Bloon speed 85%
MOAB speed 65%
Ability cooldown rate 60%

	First time	Replay	Elite
Rounds	13–42	26–45	51–70
Bananite per round	×0.2 (total:  765)	×0.05 (total:  135.5)	×0.4 (total:  1,284)
Victory bonus	250	125	1,875

Pre-placed towers

 2-0-0 Monkey Village (Longshot)
 0-0-3 Beast Handler (Laggard, Cannonball)

Reinforcements (first time)

Type 1

Round 14: 9
Round 16: 10
Round 18: 14
Round 23: 20
Round 29: 22
Round 33: 24
Round 35: 26
Round 38: 27
Round 40: 29
Round 42: 30

Reinforcements (replay)

Type 1

Round 30: 22
Round 32: 24
Round 35: 26
Round 40: 27
Round 42: 29
Round 45: 30

Reinforcements (elite)

Type 3

Round 51: 35
Round 54: 38
Round 58: 42
Round 64: 48
Round 69: 51
Round 73: 54
Round 81: 56
Round 87: 59
Round 89: 61

Spillway

Encounter

Map: Spillway
Type: Side Mission − Boss Battle
Boss: Bloonarius (Tier 5)
Roundset: Type 3

Modifiers

Bloon speed 50%
MOAB speed 50%
Removable cost rate 300%
Boss health 5%
Boss speed 30%

	First time	Replay	Elite
Rounds	51–70	66–80	61–80
Bananite per round	×0 (total:  0)	×0 (total:  0)	×0 (total:  0)
Victory bonus	10,000	7,500	25,000

Pre-placed towers

None

Reinforcements (first time)

Type 3

Round 52: 32
Round 54: 34
Round 56: 36
Round 58: 38
Round 60: 40
Round 62: 42
Round 64: 44
Round 67: 47
Round 69: 49
Round 71: 51
Round 73: 53
Round 75: 55
Round 77: 57
Round 79: 59
Round 80: 60

Reinforcements (replay)

Type 3

Round 67: 47
Round 69: 49
Round 71: 51
Round 73: 53
Round 75: 55
Round 77: 57
Round 79: 59

Reinforcements (elite)

Type 3

Round 61: 48
Round 63: 49
Round 66: 51
Round 70: 53
Round 72: 54
Round 73: 56
Round 76: 58
Round 80: 61
Round 81: 65
Round 83: 70
Round 85: 79
Round 90: 79

Map

Gallery

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  Map

In other languages

This section was last updated for: version 53.2

Language	Text	Notes
Arabic	كهف تحت الأرض	—
Danish	Underjordisk hule	—
German	Unterirdische Höhle	—
Spanish	Cueva Subterránea	—
Spanish (Latin America)	Cueva Subterránea	—
Finnish	Maanalainen luola	—
French	Grotte Souterraine	—
Italian	Grotta Sotterranea	—
Japanese	地下の洞窟	—
Korean	지하 동굴	—
Dutch	Ondergrondse Grot	—
Norwegian	Underjordisk Hule	—
Polish	Podziemna Jaskinia	—
Portuguese (Brazil)	Caverna Subterrânea	—
Russian	Подземная Пещера	—
Swedish	Underjordisk Grotta	—
Thai	ถ้ำใต้ดิน	—
Turkish	Yeraltı Mağarası	—
Chinese (simplified)	地下洞穴	—
Chinese (traditional)	地下洞穴	—