  These are extra codes that allow you to play Library in place of either stack or basement.  You don't need them in 
  order to play Citadel, but if you prefer (for some bizare reason) Library over either stage, feel free to use these.
  They must be on when the game starts or they will not work.  Use the correct codes for the region of your game.

-Zoinkity

NTSC (US Version)
"Basement -> Library" .off
81047D0C 0089
81047D0E E9E0
8102B0EC 9CA0
8102B0EE 9CA1

"Stack -> Library" .off
81047CD0 0089
81047CD2 E9E0
8102B104 9CA0
8102B106 9CA1

PAL
"Basement -> Library" .off
8104077E 4DC0
8102663C 9CA0
8102663E 9CA0

"Stack -> Library" .off
81040742 4DC0
81026654 9CA0
81026656 9CA0