Get Health:
During gameplay press Start to pause the game then HOLD 
L1 + l2 and press Up, Down, Up, Down, Left, Right, Square.

Switch Characters:
Highlight the name entry prompt for the main player on the 
character select screen and press L1, R1, L2, R2, L2, R1, L1,
Left, Left, Left, Left, R2 + Square.  Now press left or right
to pick a character.

All vs Mode Skills:
During a vs mode battle pause the game and Hold R1 and 
press Left, Left, Right, Right, L1, L1, L2, L2, L1, Right,
Left. The equipped sword will have all skills now.  For 2 
player games both players must enter the code.

Get vs Mode:
At the title screen Hold L1 and R2 and press Right + Square. 

Sword Hardness Maxed:
During gameplay press Start to pause the game then HOLD 
R1 + r2 and press Right (7 times), Left, Down, Up, Square.