Unlocks cheats for Ninja Gaiden

Unlocks

Alternate costume:

Successfully complete the game under the normal difficult setting. Then, hold L

while selecting the "New Game" option at the opening menu.

Plasma Saber:

Successfully complete the game under the normal difficult setting. A new sword

called the Plasma Saber will now be unlocked.

Extra hard difficulty:

Successfully complete the game under the normal or hard difficulty settings to

unlock the very hard difficulty setting.

Unlock all FMV sequences:

Successfully complete the game under the normal or hard difficulty settings to

unlock all FMV sequences.

Skip some FMV sequences:

Press Start, A, Start to advance past an FMV sequence.

We have more cheats and tips for this game here, Ninja Gaiden cheats