Special Stages · Stage 4
Mosquito Hell
やぶ蚊との死闘
Mosquito Hell is a Battle Cats stage in Summer Diary. It costs 70 energy and sends 11 enemy spawn lines — led by Pigge as the boss — against a 100,000 HP enemy base, and clearing it rewards 9,870 XP. Its enemies carry the Metal and Red traits, so cats that target them do the most work here.
Data updated: 2026-08-31
70Energy Cost
9,870XP Reward
100,000Enemy Base HP
4,800Stage Length
9Max Enemies
4.2Difficulty
Enemy spawns (11)
| Enemy | Strength | Count | First Spawn | Respawn | Base HP Trigger | Notes |
|---|---|---|---|---|---|---|
 Hippoe | 200% | 5 | 0.1s | 10s~20s | 100% | — |
 Metal Hippoe | 100% | 1 | 10s | — | 100% | — |
 Teacher Bear | 200% | 1 | 30s | — | 100% | — |
| Teacher Bear | 200% | 1 | 40s | — | 100% | — |
 Fireworks Guys (High-Yield) | 100% | ∞ | 50s | 33.3s~50s | 100% | — |
 Fireworks Guys (Low-Yield) | 100% | ∞ | 66.7s | 50s~66.7s | 100% | — |
 St. Pigge the 2nd | 100% | 5 | 0.1s | 33.3s | 99% | — |
 Pigge | 200% | ∞ | 0.1s | 30s~60s | 99% | — |
 Festive Otter | 100% | 3 | 0.1s | 25s | 99% | — |
| Pigge | 200% | 1 | 0.1s | — | 99% | Boss |
 Ms. Sign | 100% | ∞ | 900s | 900s | 100% | — |