Sound test
Hold [Right] + [B] + [A] and press [Start]
at the title screen. Alternately, hold [A] + [B] + [Up]
and press [Start] at the title screen.
Hints
Level 1: Fire attack
Just before you fight the Boss, there is a missile
launcher. Destroy it, then stand where it was located. Press [Down]
and jump to drop down and land on a platform. Drop down again
to get a hidden fire attack.
Level 3: Extra live
Just before the area with the elevators is an indention
in the roof. Use your chain to get up there, then do it once more
to find a hidden life and a random bonus.