Unlock Gallery 1 
     To unlock Gallery 1, beat Trial Mode without continuing. Or, play
the game for more than five hours total.
 
Unlock Gallery 2 
     To  unlock  Gallery  2, beat the game on any difficulty. Or, play
the game for more than ten hours total.
 
Unlock Game Mode Option 
     To  unlock  the Game Mode option, beat the game on Normal without
continuing.  Or,  play  the game for more than twenty hours total. The
option can be found in the Appendix menu.
 
Unlock Sound Test 
     To  unlock  Sound Test, beat the game on Easy without continuing.
Or,  play  the game for more than fifteen hours total. Sound Test will
be available in the Appendix menu.