Level Codes:

 Code         Level Name

 MEBBHKSBAL - Security zone
 MFDCRHOCCS - Cooling chamber
 WJRICCDFEU - Energy duct


 Cheat Code:

 I'm not too sure what it actually does, but here it is: `BYL ERIA'.
 As far as I can make out it makes the game slightly easier to play
 so try it.