Cheat Mode
Hold L + R + Select + Start on controller two and press Start on controller one at the title screen. A cheat menu with series, mission, invincibility, song, sound effects and sound group options will appear.

Level Passwords

System         Password  
Border Zone    XGBBKGXMZW  
Midgard        DBBZHHBBZ2  
Jotunheim      XGZZKBV3BX  
Bifrost        5B3CKGWVW2  
Valgard        3G3HHBFV8B  
Vigrid         3VVWHBFMRG