Alternate costumes

A": Default
"B": Alternate default color
"A" + "G": Guard
"B" + "G": Alternate guard color
"K": New Soul Blade

Obtain all of Sophitia's weapons in Edge Master mode to choose her armor-less hidden costume from her ending. Obtain all 70 weapons in Edge Master mode to choose Sophitia's hidden swimsuit costume from her hidden ending.
Camera control during ending frame

Hold "A": Zoom in
Hold "B": Zoom out
[Up]: Top view
[Down]: Horizontal view
[Left]: Spin counter-clockwise
[Right]: Spin clockwise

Get last weapon in Edge Master mode
Defeat SoulEdge and let the ending sequence complete. After returning to the map screen, press "K" and choose Move. The CPU will select a destination. If you lose the match, press "K" again and allow the CPU to select the country. The CPU will always select the location of the last weapon.

Fight as Soul Edge
Enter "ALL" as a name. Alternatively, complete the game with all the regular characters on any difficulty setting or play the game a total of twenty cumulative hours.

Fight as Siegfried!, Sophitia!, and Sophitia!!
Win all eight weapons for both Siegfried and Sophitia to play as Siegfried! and Sophitia!. They are alternate characters that have different costumes. Sophitia's third version, Sophitia!!, will be accessible after obtaining all 70 weapons in Edge Master mode.

Fight as Han Myong
Perform Hwang's followed by Seung Mi Na's alternate endings.

Alternate title screen
Complete the game with all ten characters. The title screen will change to one that shows all of the characters.

Alternate opening voice
When the game is boots, sometimes the voice that says "Namco" at the start will be Seung Mina's instead of the deep voiced announcer. Because of her accent, she will say "Namico". Note: This may only work on the PAL version of the game.

Alternate endings
Enter the following sequences during the ending when the black lines at the top and bottom of the screen disappear.

Cervantes: Press "B".
Hwang: Press "A".
Li Long: Press "A", "B" repeatedly to make him stand up.
Mitsurugi: Beat Tanegashima by pressing [Left] or [Right] to avoid the bullet. Then run forward and attack with "B" before he reloads.
Rock: Press "B".
Seung Mina: Quickly press [Down], [Up] to make her dodge.
Siegfried: Press "B".
Sophitia: Move [Right].
Taki: Press "G" to guard Soul Edge's attack.
Voldo: Quickly press [Up], "Ddown" repeatedly until Soul Edge breaks.