Underground Labyrinth · Stage 21

Underground B21F

地底21層

Underground B21F is a Battle Cats stage in Underground Labyrinth: The Grand Deep. It costs 30 energy and sends 5 enemy spawn lines against a 350,000 HP enemy base, and clearing it rewards 1,692 XP. Its enemies carry the Black trait, so cats that target it do the most work here.

Data updated: 2026-08-31

30Energy Cost
1,692XP Reward
350,000Enemy Base HP
5,200Stage Length
5Max Enemies
8.3Difficulty
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Cats that counter Underground B21F

Cats whose attacks target Black, best DPS first — the traits this stage’s enemies actually carry:

Chun-LiLovestruck Lesser DemonTakeda ShingenDaybreaker IzanagiMighty Rekon KorpsMusashi Miyamoto

Stage rewards

50% — XP ×200,000 · Treasure Radar

Enemy spawns (5)

EnemyStrengthCountFirst SpawnRespawnBase HP TriggerNotes
Doge Dark600%∞13.3s16.7s~23.3s100%—
Dark Otter100%123.3s—100%—
Doge Dark600%353.3s30s100%—
Dark Otter100%166.7s—100%—
Shadow Boxer K200%186.7s—100%—
All Underground Labyrinth: The Grand Deep stages