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On games two and three, there is a room in the Red Dungeon in the Black Castle that will flash even if the player has only one object with them. They will need to have the bridge with them and they will have to place it at about the middle of the screen. They will then cross the bridge down to the bottom, slightly right of center to a small chamber, then go to the bottom right of that chamber, which they will pick up a dot.
They need to take the dot and place it in the room right above the Catacombs, then take any two objects to pass through the wall and see the programmer's name.