Special Stages · Stage 2
Aku Studies 301: Methods
悪魔研究Ⅲ方法
Aku Studies 301: Methods is a Battle Cats stage in Empress' Report 3. It costs 100 energy and sends 10 enemy spawn lines — led by Super Metal Hippoe as the boss — against a 880,000 HP enemy base, and clearing it rewards 8,930 XP. Its enemies carry the Aku and Metal traits, so cats that target them do the most work here.
Data updated: 2026-08-31
100Energy Cost
8,930XP Reward
880,000Enemy Base HP
4,700Stage Length
15Max Enemies
9.3Difficulty
Enemy spawns (10)
| Enemy | Strength | Count | First Spawn | Respawn | Base HP Trigger | Notes |
|---|---|---|---|---|---|---|
 Miz Devil | 300% | 1 | 10s | — | 100% | — |
 Metal Hippoe | 300% | 1 | 13.3s | — | 100% | — |
| Miz Devil | 300% | 2 | 20s | 3.3s~10s | 100% | — |
| Miz Devil | 300% | 2 | 33.3s | 3.3s~6.7s | 100% | — |
| Metal Hippoe | 300% | ∞ | 0.1s | 33.3s~40s | 99% | — |
 Super Metal Hippoe | 200% | 1 | 0.1s | — | 99% | Boss |
| Miz Devil | 300% | 30 | 0.1s | 6.7s~13.3s | 99% | — |
| Miz Devil | 300% | 15 | 0.1s | 3.3s~6.7s | 99% | — |
| Miz Devil | 300% | ∞ | 0.1s | 16.7s~23.3s | 99% | — |
 Ms. Sign | 100% | ∞ | 900s | 900s | 100% | — |