The Castle mission introduces more complex enemy types and a multi-level environment. You'll need to adapt your strategies to deal with armored foes and ranged attackers. The tighter corridors and staircases can make crowd control challenging.

Guide for Mission 1-2: Castle in Resident Evil: The Mercenaries 3D, featuring new enemy types and environmental challenges.
The Castle mission introduces more complex enemy types and a multi-level environment. You'll need to adapt your strategies to deal with armored foes and ranged attackers. The tighter corridors and staircases can make crowd control challenging.
