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 13: 8
Round 15: 9
Round 17: 13
Round 22: 19
Round 28: 21
Round 32: 23
Round 34: 25
Round 37: 26
Round 39: 28
Round 41: 29

Reinforcements (replay)

Type 1

Round 29: 21
Round 31: 23
Round 34: 25
Round 39: 26
Round 41: 28
Round 44: 29

Reinforcements (elite)

Type 3

Round 50: 34
Round 53: 37
Round 57: 41
Round 63: 47
Round 68: 50
Round 72: 53
Round 80: 55
Round 86: 58
Round 88: 60

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 51: 31
Round 53: 33
Round 55: 35
Round 57: 37
Round 59: 39
Round 61: 41
Round 63: 43
Round 65: 45
Round 67: 47
Round 69: 49
Round 71: 51
Round 73: 53
Round 75: 55
Round 77: 57
Round 79: 59

Reinforcements (replay)

Type 3

Round 66: 46
Round 68: 48
Round 70: 50
Round 72: 52
Round 74: 54
Round 76: 56
Round 78: 58

Reinforcements (elite)

Type 3

Round 60: 47
Round 62: 48
Round 65: 50
Round 69: 52
Round 71: 53
Round 72: 55
Round 75: 57
Round 79: 60
Round 80: 64
Round 82: 69
Round 84: 78
Round 89: 78

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	—