"LABRADY" : Full ammo
"LABUG" : Insect mode toggle; Lets you get up close to walls
"LACDS" : Map reveal toggle. Type it once to get a full detailed map, showing item locations as well as enemy location and movement. Typing it again changes the colour of any "steps" to a darker green colour. Typing it a third time turns Supermode off. 

Blue triangle = shield units;
Blue square = ammo;
Grey triangle = deceased opponent;
Orange triangle = dynamic scenery.
Yellow dot = static scenery;
Yellow circle = Mouse Droid;
Yellow triangle = live opponent;
"LADATA" : Displays x,y,z coordinates
"LAIMLAME" : Invincibility toggle; (you can still die falling)
"LANTFH" : Teleport to start point.
"LAMAXOUT" : Everything Added; All weapons, full health, shields, ammo, items.
"LAOZ" : Dorothy Mode; Speeds up music and voices, and shrinks enemies half their normal size.
"LAPOGO" : Disables height checking. If you walk up to a wall with a ledge above it, you will move to that ledge.
"LAPOSTAL" : All weapons and ammo added
"LARANDY" : Weapons super charge; temporary. Increases firing rate.
"LAREDLITE" : Pondering toggle; freeze all of your enemies
"LASKIP" : Force completion of current mission
"LATERMINATE" : Rampage Mode; Full invincibility, unlimited ammo, and unlimited weapon supercharge.
"LAUNLOCK" : Inventory added; keys, infrared goggles, ice cleats etc.

Level codes

LASECBASE 1 Secret Base
LATALAY 2 Talay: Tak Base
LASEWERS 3 Anoat City
LATESTBASE 4 Research Facility
LAGROMAS 5 Gromas Mines
LADTENTION 6 Detention Centre
LARAMSHED 7 Ramsees Head
LAROBOTICS 8 Robotic Facility
LANARSHADA 9 Nar Shaddaar
LAJABSHIP 10 Jabba's Ship
LAIMPCITY 11 Imperial City
LAFUELSTAT 12 Fuel Station
LAEXECUTOR 13 The Executor
LAARC 14 The Arc Hammer

Rumoured Codes (easter egg)   Rumoured codes, yet to be successful are:

"LADIDAOOHLALAFALALALALALALALAH" : Mohc is naked in cut scenes
"LAQUICKBROWNFOXJUMPSOVERTHELAZYDOG" : Measures your typing abilities
"LAISASLADOESYOUKNOWWHATIMTALKINGABOUT" : You need to be 18 and over
"LA" followed by "SPAM" 11 times : Carpal tunnel activation

Easter Eggs  -  [I'm told there are also two Ewoks chained somewhere. Is this another cheat, or is the first one wrong?] (easter egg). One secret area has a Jawa chained in a locked room. One of the secret places you can go to is in the shape of Max's head (from Sam & Max hit the road), and if you look up at the controls of the moving platform in one of the levels, you can read a graffiti on the wall.