----- LEVEL 1 ------------ LEVEL 4 --------
Section 1-"AAAAAAAA" | Section 1-"FZQAXXUA"
Section 2-"ETQCWXLB" | Section 2-"GDQLWXIJ"
Section 3-"EXQBEXYP" | Section 3-"GHQLVXVJ"
----- LEVEL 2 ------- ----- LEVEL 5 -------
Section 1-"FBQBRXYH" | Section 1-"GIQCOXRG"
Section 2-"FFQBYXRL" | Section 2-"GLQZGXCJ"
Section 3-"FJQHMXPH" | Section 3-"GQQBJXOF"
----- LEVEL 3 ------
Section 1-"FNQERXAO"
Section 2-"FRQDRXWH"
Section 3-"FUQZNXFL"
You're not actualy given a code for Level 5 Subsection 4 but I've found that typing `CHEAT ON' (with spaces) as a password will skip you straight to it. I'm quite sure this has other effects during the game but I've been unable to discover just what these are.