In X-Naut Fortress go in to the ventilation shaft in sublevel 2 and drop through the far right vent in to the dressing room Open the curtain of the stall you fall in to and Mario and all his partners will become 8-bit (they will look as they would on an 8-bit system like the NES) until you leave the room Entering the room the normal way via the door and going in to this stall closing the curtain and opening it again will not work