Hagane

Unlimited continues:
Choose the "Configure Options" selection and use the Music icon. Play selections 9, 8, 7, and 6 in order for approximately fifteen seconds each. Begin game play and intentionally lose all three lives. An infinity symbol will appear on the continue screen to confirm correct code entry.

Special attacks:
Press L or R to somersault with the Ninja. Press Attack during the first jump of the somersault to execute a Dragon Punch or Jump to execute a Flying Kick. Press Attack during the second jump to execute a Reverse Kick or Jump to execute a Fire Kick. Press Attack during the third jump to execute a Sword Dragon Attack or Jump to execute a Vertical Fire Kick .
Information in this section was contributed by GIBA.

Secret room:
Take the elevator up in level 3-2. After arriving at the top, move directly to the left. Kill the opponents to get several items including energy, extra lives, bombs, etc.
Information in this section was contributed by GIBA.

Hard mode:
Successfully complete the game and wait for the credits to end. Start another game to play as Super in hard mode.
Information in this section was contributed by GIBA.