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 (which resembles a lightsaber from Star Wars) will now
be unlocked.
Skip FMV sequences:
Press Start, A, Start to advance past an FMV sequence. Note: This does not
work all of the time.
All FMV sequences:
Successfully complete the game under the normal or hard difficulty settings to
unlock all FMV sequences.
Very hard difficulty:
Successfully complete the game under the normal or hard difficulty settings to
unlock the very hard difficulty setting.
Sites: