How to Open Red Doors & Chests (& All Locations) in Dragon Quest 1 Remake

Players will start encountering red doors and chests very soon after starting Dragon Quest 1 HD-2D Remake. Players will not be able to unlock those doors and chests immediately, though, as they must obtain a special key first. This guide is here to provide information about that key, while also detailing the location of every red door and chest in Dragon Quest 1 HD-2D Remake.