Collaboration Stages · Stage 8
Impregnable Fortress
不落の移動要塞
Impregnable Fortress is a Battle Cats stage in Street Fighter (Normal). It costs 150 energy and sends 6 enemy spawn lines — led by Guile (Enemy) as the boss — against a 150,000 HP enemy base, and clearing it rewards 21,150 XP. Its enemies carry the Red trait, so cats that target it do the most work here.
Data updated: 2026-08-31
150Energy Cost
21,150XP Reward
150,000Enemy Base HP
6,000Stage Length
20Max Enemies
5.1Difficulty
Enemy spawns (6)
| Enemy | Strength | Count | First Spawn | Respawn | Base HP Trigger | Notes |
|---|---|---|---|---|---|---|
 Those Guys | 400% | ∞ | 0s | 6.7s~13.3s | 100% | — |
 Hippoe | 400% | ∞ | 0s | 20s~26.7s | 100% | — |
 Jackie Peng | 400% | ∞ | 3.3s | 26.7s~33.3s | 100% | — |
 Guile (Enemy) | 35% | 1 | 13.3s | — | 100% | Boss |
 Ken (Enemy) | 35% | 1 | 43.3s | — | 100% | — |
 Ms. Sign | 100% | ∞ | 900s | 900s | 100% | — |