Expert mode (Pac Attack):
Select arrange mode. Highlight "Veteran" at the difficulty selection screen, then hold Right and press Circle.

Edit mode (Road To Godhand):
Use the "Save Data" option to save the game ten times. An "Edit Mode" option will now be available.

Super passwords (Legend of Valkrie):
Enter VVQ5K5H676FKUTT5K9 as a password to start at Level 93 with 1006 HP in original mode. Enter B4LIA201H04H9H0FG4 as a password to start at level 81 by going home and sleeping.

Hidden Map Masamune (King of Kings):
Complete the game in "Original" mode. Wait at the "War Is Over" screen until a hidden map appears, which is the first map in "Arrange" mode.

Bonus options (King of Kings):
Press L1(2), L2(5), R1(2), R2(5) at the "Arrange" mode title screen. Start a game in "Story" mode, then enter the "Game Settings" screen to find additional options.