All weapons 
Enter "GBZRK" as a password. 

Maximum ammunition 
Enter "SLGFST" as a password. 

Play as General Plastro 
Enter "PLSTRLVSVG" as a password.

Play as Vikki 
Enter "GRNGRLRX" as a password.

Display debug information 
Enter "THDTST" as a password.

Mini mode 
Enter "DRVLLVSMM" as a password.

Tin foil uniform 
Enter "TNMN" as a password. Note: This is not armor, although there is a resemblance. 

Level passwords 
Level                  Password 
2 Bridge             FLLNGDWN 
3 Fridge             GTMLK 
4 Freezer           CHLLBB 
5 Inside Wall     CLSNGN 
6 Graveyard       DGTHS 
7 Castle             FRNKNSTN 
8 Tan Base        BDBZ 
9 Revenge         LBBCK 
10 Desk            DSKJB 
11 Bed              GTSLP 
12 Blue Town    SMLLVLL 
13 Cashier        CHRGT 
14 Train            NTBRT 
15 Rockets          RDGLR 
16 Pool Table        FSTNLS 
17 Pinball Table   WHSWZRD