Collaboration Stages · Stage 1♪ Birthday Party ♪♪バースデーパーティー♪39Energy Cost5,499XP Reward1,000Enemy Base HP4,500Stage Length7Max Enemies1.1Difficulty Test your team vs this stageStage rewards100% — Cat Food ×20 · first clearEnemy spawns (6)EnemyStrengthCountFirst SpawnRespawnBase HP TriggerNotesFireworks Guys (High-Yield)100%∞0s10s~16.7s100%—Fireworks Guys (Low-Yield)100%∞5s10s~16.7s100%—Glowstick Guys100%∞10s6.7s~16.7s100%—MikuDoge1%∞6.7s6.7s~16.7s100%—Happy Birthday Cake100%10s—100%BossMs. Sign100%∞900s900s100%—All Hatsune Miku's Birthday! stages