Tin Castle is the 4th mission of Ace Combat 2. Allied intelligence has located the enemy's main forward base by analyzing their attack vector from recent attacks. The base in question turns out to be an ancient castle at the Amber Mountains, which is defended by AA artillery and aircraft squadrons. The player's objective is to approach and sanitize the area of hostiles. For the first time, the player is given the ability to launch alongside wingmen. The alternate 4th mission Opera House can be unlocked if both warships are destroyed in the City On Fire mission.