Collaboration Stages · Stage 8Impregnable Fortress不落の移動要塞150Energy Cost21,150XP Reward150,000Enemy Base HP6,000Stage Length20Max Enemies5.1Difficulty Test your team vs this stageStage rewards100% — Ryu Cat · first clearEnemy spawns (6)EnemyStrengthCountFirst SpawnRespawnBase HP TriggerNotesThose Guys400%∞0s6.7s~13.3s100%—Hippoe400%∞0s20s~26.7s100%—Jackie Peng400%∞3.3s26.7s~33.3s100%—Guile (Enemy)35%113.3s—100%BossKen (Enemy)35%143.3s—100%—Ms. Sign100%∞900s900s100%—All Street Fighter (Normal) stages