-Plug the controller into port two and press any button before fighting Psycho Mantis. The word "Hideo" will appear in the corner of a black screen. Use controller two to fight against Mantis to prevent him from knowing your moves. Alternatively, shoot the statues in the top corners with the fa-mas to render Psycho Mantis without his psychic abilities.
-Toss a stun grenade right when Psycho Mantis takes control of Meryl. When he starts attacking, pause game play and switch to controller two.
-With a Bandana, shoot in one large circle. If he throws chairs around, crouch on the ground so you will not be hit.
-If you have no way of seeing Psycho Mantis when fightingt him, run around. If the screen zooms in, he is nearby.
-To prevent Psycho Mantis from reading your mind, destroy the two statues on both sides of the room, toward the back. They are of Mantis' face. He hates to see himself.