Psycho Mother is a boss fought in Contra: Hard Corps. In Stage 3, right before entering the room to fight the Computer Hacker, if the player climbs up the wall, he or she will find a mysterious character. He will ask if you want to fight in the arena. If the player answers "Yes", the player will go to an arena where they will fight Simondo Belmont, Psycho Mother and Warp Bomber.