Collaboration Stages · Stage 1
♪ Birthday Party ♪
♪バースデーパーティー♪
♪ Birthday Party ♪ is a Battle Cats stage in Hatsune Miku's Birthday!. It costs 39 energy and sends 6 enemy spawn lines — led by Happy Birthday Cake as the boss — against a 1,000 HP enemy base, and clearing it rewards 5,499 XP. Its enemies carry the Metal trait, so cats that target it do the most work here.
Data updated: 2026-08-31
39Energy Cost
5,499XP Reward
1,000Enemy Base HP
4,500Stage Length
7Max Enemies
1.1Difficulty
Enemy spawns (6)
| 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% | ∞ | 5s | 10s~16.7s | 100% | — |
 Glowstick Guys | 100% | ∞ | 10s | 6.7s~16.7s | 100% | — |
 MikuDoge | 1% | ∞ | 6.7s | 6.7s~16.7s | 100% | — |
 Happy Birthday Cake | 100% | 1 | 0s | — | 100% | Boss |
 Ms. Sign | 100% | ∞ | 900s | 900s | 100% | — |