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From The PSUPedia

Co-op missions are missions which are very similar in style to free missions, however they contain some elements of party missions. Even though co-op missions can be initiated by a single player, they require more than one player to complete with a grade of S due to field elements such as multi-person switches which open doors leading to additional enemies.

GUARDIANS Colony

• True Darkness

Parum

• Crimson Beast
• Duel in the Ruins
• Electronic Brain

Neudaiz

• Cost of Research
• Forest Infiltration
• The Eastern Peril
• Flowery Pursuit

Moatoob

• Rogues' Shortcut
• Stolen Weapon