Successfully complete the game on the indicated difficulty setting to unlock the 
corresponding mode(s). Select "Extras", "Unlockables", then "Cheats" to access 
and toggle the modes.

Master All Moves: Successfully complete the game on the Normal difficulty 
setting. This mode gives you full mastery of every move and combo.
Song Of Death mode: Successfully complete the game on the Normal difficulty 
setting. This mode allows you to permanently activate the Song Of Death power.
Armour Power: Successfully complete the game on the Hard difficulty setting. 
This mode gives you infinite magic energy.
Invulnerability mode: Successfully complete the game on the King difficulty 
setting.