Bionic Commando (Top Secret- J) for the NES featured a great new character with a cool new ability - the Bionic Arm! Learning how to use this device is very fun and is a large part of the game's appeal. The setting is a sort of WWII/Hitler-esque wartime action piece. The Nazi elements were removed from the US release, but are present in the Japanese version. We're delivered great graphics, classic Capcom styled music, some nice 8-bit animations including a great explosion during the game's animated ending!
V-Note’s Bionic Commando Guide is a walkthrough aimed at collecting all of the available items and includes how to find the secret Helmet in the hidden routes.
To get to the secret area in Area 3, do something similar to what is shown here.