At the title screen, highlight the "New Game" option, then press TRIANGLE, SQUARE, CIRCLE, TRIANGLE, SQUARE, CIRCLE, X. If you entered the code correctly, you will hear Etna's voice. In the Japanese version, highlight the "New Game" option at the title screen, then press TRIANGLE, SQUARE, X, TRIANGLE, SQUARE, X, CIRCLE. Alternately, beat the game after reading Etna's entries in her secret chamber. To enter Etna's secret chamber, press the two secret buttons in Laharl's Castle. The first button is behind the throne. The second button is inside the skull on the counter in RosenQueen's store. After both buttons are pressed, go to the room where Longinus, Ghoss, Stigma, and Gargo are usually found. Press X in the corner behind Stigma to reveal the door.