On the game mode screen highlight the "Arrange" option and hold Right until that option turns green. Then start a game and double the normal amount of ink ribbons and ammunition will be available. Note: This does not effect other items such as health sprays or herbs.
Finish the game in under three hours without rescuing anyone. If done correctly a rocket will appear after the credits. Then choose to continue playing after the game restarts. Now the rocket launcher with infinite ammunition will be available when the new game begins.
Rescue the other two players and finish the game. If done correctly the phrase "You've got the special key=" will appear after the credits. Save the game. Start the game that was just saved. Enter the room with the large mirror on the second floor of the mansion. Unlock the door in the back. Enter the closet and move all the way to the end of the rack of clothes. Then a message asking "There is an outfit that fits you perfectly do you want to put it on?" will appear. Now select "Yes" to change your character's clothes. Note: When playing the game with the "Arrange" option your character will not have the key but the door will be unlocked.
Pause the game and press Start Select.