Underground Labyrinth · Stage 4
Underground B4F
地底4層
Underground B4F is a Battle Cats stage in Underground Labyrinth: The Grand Deep. It costs 20 energy and sends 7 enemy spawn lines — led by Doge Dark as the boss — against a 200,000 HP enemy base, and clearing it rewards 1,128 XP. Its enemies carry the Black and Floating traits, so cats that target them do the most work here.
Data updated: 2026-08-31
20Energy Cost
1,128XP Reward
200,000Enemy Base HP
5,000Stage Length
20Max Enemies
7.2Difficulty
Enemy spawns (7)
| Enemy | Strength | Count | First Spawn | Respawn | Base HP Trigger | Notes |
|---|---|---|---|---|---|---|
 Doge Dark | 200% | 3 | 13.3s | 13.3s~16.7s | 100% | — |
 Mooth | 1200% | 1 | 23.3s | — | 100% | — |
 Squire Rel | 1200% | ∞ | 33.3s | 6.7s~10s | 100% | — |
 Shadow Boxer K | 150% | 1 | -6.7s | — | 99% | — |
| Doge Dark | 200% | ∞ | 10s | 23.3s~26.7s | 99% | — |
| Doge Dark | 200% | 1 | 10s | — | 99% | Boss |
| Mooth | 1200% | 1 | 23.3s | — | 99% | — |