Press 2(up), 2(left), 2(right), 2(down), up, left, right, down, up, left, right, down at the main screen.
At the main screen, press 4(R1, L1, L2, R2).
At the main screen, press 4(square), 4(circle), 4(triangle), square, circle, triangle.
Collect all of the stars from the Star Search Challenges.