On the options screen, press TRIANGLE, SQUARE, CIRCLE, SQUARE, TRIANGLE, SQUARE, L1, L1+R1, SELECT, SELECT. A skull should appear. Then, press TRIANGLE, SQUARE, L1, L1, L1, SQUARE, TRIANGLE.

On the options screen, highlight "Password." Hold SELECT and press TRIANGLE, L1, SQUARE. Then release SELECT and press TRIANGLE, L1, SQUARE, TRIANGLE, L1, SQUARE.

Mission 2 - X, CIRCLE, TRIANGLE, SQUARE, X, X, X, SQUARE
Mission 3 - TRIANGLE, TRIANGLE, CIRCLE, X, TRIANGLE, TRIANGLE, X, SQUARE
Mission 4 - CIRCLE, CIRCLE, CIRCLE, TRIANGLE, X, TRIANGLE, SQUARE, SQUARE
Mission 5 - SQUARE, X, CIRCLE, TRIANGLE, X, SQUARE, TRIANGLE, TRIANGLE