Underground Labyrinth · Stage 81
Underground B81F
地底81層
Underground B81F is a Battle Cats stage in Underground Labyrinth: The Grand Deep. It costs 50 energy and sends 9 enemy spawn lines — led by Super Metal Hippoe as the boss — against a 800,000 HP enemy base, and clearing it rewards 2,820 XP. Its enemies carry the Metal, Angel and Colossus traits, so cats that target them do the most work here.
Data updated: 2026-08-31
50Energy Cost
2,820XP Reward
800,000Enemy Base HP
5,300Stage Length
20Max Enemies
9.4Difficulty
Enemy spawns (9)
| Enemy | Strength | Count | First Spawn | Respawn | Base HP Trigger | Notes |
|---|---|---|---|---|---|---|
 Croconator | 100% | 10 | 3.3s | 3.3s~10s | 100% | — |
 Mr. Angel | 150% | 4 | 13.3s | 13.3s~20s | 100% | — |
 Great Angel Chibinel | 100% | 1 | 30s | — | 100% | — |
| Croconator | 100% | ∞ | 60s | 6.7s~10s | 99% | — |
| Mr. Angel | 150% | 3 | 26.7s | 1s~2s | 99% | — |
| Mr. Angel | 150% | 3 | -26.7s | 1s~2s | 99% | — |
| Mr. Angel | 150% | 3 | -53.3s | 1s~2s | 99% | — |
| Great Angel Chibinel | 100% | 1 | 53.3s | — | 99% | — |
 Super Metal Hippoe | 200% | 1 | 13.3s | — | 99% | Boss |