All Characters in Multi-player Mode
Enter VRCLN as a password.
Enter the password NSRLS.
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.
To display some rather useless test information, enter the password THDTST.
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.
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.
Enter the password MMLVSRM.
Enter the password DRVLLVSMM to become smaller.
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
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.
To restart the current level, hold L + R + down-C.