Down x5, Up x4, R
20 Extra Grenades
A, B, Left, A, B, Right, B, A, Down, R Shift
Extra Credits
A, B, X, Y, L Shift, R Shift, Up, Down, Left, Right
Extra Lives
Up - Down - Left - Right - X - Up - Down - Left - Right - Y
Infinite Shields
Up, Down, Left, Right, X, Up, Down, Left, Right, Y
Invincibility
Up - Down - Up - Down - Up - Down - Left - Right - Right - Y
Level Select
Y - Y - X - X - L Button - R Button - Down - Down - Up - Up
Level Skip
L, Left, R, Right, X, X, Down, Down, R, L
Over-the-Shoulder View
L, R, L, R, Left, Right, Left, Right, Y, X
Watch Ending