Tin Foil Uniform
     Enter the code 'TNMN'.

Level Select
     Enter the code 'LLLVLS'.

All Weapons
     Enter the code 'NSRLS'.

Max Ammo
     Enter the code 'MMLUSRM'.

Play as General Plastro
     Enter the code 'PLSTRLVSVG'.

Play as Vikki
     Enter the code 'GRNGRLRX'.

Display Debug Info
     Enter the code 'THDTST'.

Mini Mode
     Enter the code 'DRVLLVSMM'.

Level Passwords
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