At the title screen, press the following codes, fast.

Code	Effect
X, Y, R, Y, X, Right, L, Left, R, L, Y, X, Right, Left, L, R, Start	Ending Test screen.
X, Y, L, R, X, Y, L, R, X, Y, L, R, X, Y, L, R, Start	Next Stage screen.
X, Y, L, R, Left, Right, Y, X, R, L, Right, Left, Start	Sound Test.
Y, X, R, L, Right, Left, X, Y, L, R, Start	Turn collision detection on/off.