• All characters (in multi-player mode) -- VRCLN
• All weapons -- NSRLS
• Full ammo – MMLVSRM
• Large mode -- LVNLRG
• Last Situation -- DHSTHMN
• Mini Mode -- DRVLLVSMM
• Play as Gen. Plastro -- PLSTRLVSVG
• Play as Tin Soldier -- TNSLDRS
• Play as Vikki -- GRNGRLRX
• Test information -- THDTST

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.
Submitted by Hassan Razvi

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.
Submitted by farve2586

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

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

Tin Anybody
First, type in a code for which character you want to be, then type in the tin soldier code. (It makes the characters have tin armor but it doesn't make you any stronger) You will turn into people like Tin Vicky or Tin Plastro.
Submitted by Dan Gregson