Underground Labyrinth · Stage 51Underground B51F地底51層Data updated: 2026-07-2440Energy Cost2,256XP Reward600,000Enemy Base HP3,900Stage Length25Max Enemies9.1Difficulty Build a lineup for this stage Test your team vs this stageStage rewards50% — XP ×300,000 · Treasure RadarEnemy spawns (6)EnemyStrengthCountFirst SpawnRespawnBase HP TriggerNotesB.B.Bunny3000%∞13.3s2s~3s100%—Shy Boy800%140s—100%—The Face1000%10.1s—99%BossB.B.Bunny3000%∞13.3s26.7s~30s99%—Shy Boy800%36.7s26.7s~33.3s99%—Shy Boy800%1-33.3s—99%—All Underground Labyrinth: The Grand Deep stages