Collaboration Stages · Stage 7
Impregnable Fortress
不落の移動要塞
Impregnable Fortress is a Battle Cats stage in Street Fighter (Easy). It costs 90 energy and sends 7 enemy spawn lines — led by Guile (Enemy) as the boss — against a 8,000 HP enemy base, and clearing it rewards 12,690 XP.
Data updated: 2026-08-31
90Energy Cost
12,690XP Reward
8,000Enemy Base HP
6,000Stage Length
5Max Enemies
2.1Difficulty
Enemy spawns (7)
| Enemy | Strength | Count | First Spawn | Respawn | Base HP Trigger | Notes |
|---|---|---|---|---|---|---|
 Those Guys | 100% | 4 | 0s | 2s~3.3s | 100% | — |
 Croco | 100% | ∞ | 13.3s | 22.7s~25.3s | 100% | — |
 Guile (Enemy) | 2% | 1 | 26.7s | — | 100% | Boss |
| Those Guys | 100% | ∞ | 46.7s | 15.3s~18.7s | 100% | — |
 Gory | 100% | 3 | 66.7s | 32s~35.3s | 100% | — |
 Kang Roo | 100% | 1 | 80s | — | 100% | — |
 Ms. Sign | 100% | ∞ | 900s | 900s | 100% | — |