Special Stages · Stage 1
Ultra Stress! (Insane)
ウルトラ重圧！超激ムズ
Ultra Stress! (Insane) is a Battle Cats stage in Monthly Event All-Stars Ultra Celebration!. It costs 100 energy and sends 11 enemy spawn lines — led by Chief Peng as the boss — against a 881,000 HP enemy base, and clearing it rewards 14,100 XP. Its enemies carry the Red, Aku and Floating traits, so cats that target them do the most work here.
Data updated: 2026-08-31
100Energy Cost
14,100XP Reward
881,000Enemy Base HP
4,600Stage Length
12Max Enemies
7.2Difficulty
Enemy spawns (11)
| Enemy | Strength | Count | First Spawn | Respawn | Base HP Trigger | Notes |
|---|---|---|---|---|---|---|
 Fireworks Guys (High-Yield) | 100% | ∞ | 0s | 10s~16.7s | 100% | — |
 Fireworks Guys (Low-Yield) | 100% | ∞ | 3.3s | 10s~16.7s | 100% | — |
 Chief Peng | 100% | ∞ | 80s | 10s~16.7s | 100% | — |
| Chief Peng | 100% | 4 | 26.7s | 0.7s~2s | 100% | — |
| Chief Peng | 100% | 1 | 6.7s | — | 100% | Boss |
 Squire Rel | 3200% | 5 | 53.3s | 6.7s | 100% | Boss |
 Dark Emperor Santa | 400% | 1 | 40s | — | 100% | Boss |
 Lucky Sloth | 100% | 1 | 46.7s | — | 100% | Boss |
 Shy Boy | 1000% | 3 | 133.3s | 6.7s | 100% | — |
 Kory | 100% | 1 | 213.3s | — | 100% | Boss |
 Ms. Sign | 1200% | ∞ | 900s | 900s | 100% | — |