Cycle Through Weapons Backwards
To browse through your weapons in reverse order, During the game, hold the Z button and press the B button to cycle through each gun.

Restart Level
To restart the current level, hold L + R + down-C.

Light the Candles
On the living room level when you get to the top of the couch, go near the ruler that is a bridge over to the other side. Use your flame thrower or your morter to light the candles.

Debug Mode
To display some rather useless test information, enter the password THDTST.

Mini Mode
Do you envy "Mini Me"? Fret no more. Just enter the password DRVLLVSMM and see how your smaller half lives.

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

Play as Vikki
Enter "GRNGRLRX" as a password.

Play as a Tin Soldier
Enter TNSLDRS as a password.

All Characters in Multi-player Mode
Enter VRCLN as a password.

Maximum Ammunition
Enter the password MMLVSRM.

Passwords
Level Password
Attack LNLGRMM
Spy Blue TRGHTR
Bathroom TDBWL
Riff Mission MSTRMN
Forest TLLTRS
Hoover Mission SCRDCT
Thick Mission STPDMN
Snow Mission BLZZRD
Shrap Mission SRFPNK
Fort Plastro GNRLMN
Scorch Mission HTTTRT
Showdown ZBTSRL
Sandbox HTKTTN
Kitchen PTSPNS
Living Room HXMSTR
The Way Home VRCLN

Fry the Colonel
If your feeling particularly sadistic, feel free to slaughter your commander at either the obstacle course or the live fire range. He'll call the MPs out, but I've never actually seen them come.

All Weapons
Enter the password NSRLS.

Invincibility Code
Enter MLMHTKP as a password.