On Dantooine during your Jedi training you will be sent to investigate someDark power emanations in the wilderness. When you find Juhani, you can turn her to the Light Side and have her join your party, or you can threaten to kill her. Do so and you will set off an interesting chain of events that not only lose you Juhani as a party member (since she's dead) but sends another Jedi member towards the Dark Side.
Easy Heal
Anytime you are in a safe area (not in combat or inside a room) you can instantly heal yourself. Go to the Map screen in the pause menu and hit the X Button to instantly leap back to the Ebon Hawk. Your party members will be magically healed. You can then select the Map screen and hit X again to jump back to where you just were.
Kill Good Guys on Tatooine
After helping the men defend the Sand Crawler in the desert, put on Sand People outfits (taken from dead Sand Folk) and return to the Sand Crawler. The men will attack you, thinking you are enemies. You are free to defend yourself and kill them. Truly an evil act.
Earn Different Endings
Finish game on the Light Side (by doing good deeds and denying the Dark Side) to see the Light Side ending. Finish game on the Dark Side (by doing evil and accepting the Dark path) to see the Dark Side ending.
Extra Sidequests
Talk to the other members of your party often. Most have an extra side quest that can only be activated by talking to them at least 8 times during the game. Sometimes it takes even more. Bastila's, for example, has you searching for her mother on Tatooine and Carth's has you hunting for his lost son.
Finding Party Members
Bastila - Jedi Human - Taris
Canderous - Mandalorian Soldier - Taris
Carth - Human Soldier - Endar Spire
HK-47 - Combat Droid - Tatooine (buy him in the droid shop)
Jolee Bindo - Jedi Human - Kashyyyk
Juhani - Jedi Guardian - Dantooine (don't kill her!)
Mission - Tw'lek Scoundrel - Taris
Zaalbar - Wookie Scout - Taris
T3-M4 - Expert Droid - Taris
Get extra items
On the Ebon Hawk, talk to each member of your crew. You can ask each one to make you specific items:
On Korriban in the Valley Of The Dark Lords there are four tombs. One of these tombs is full of droids that attack you. Destroy all of the hostile droids and open the door at the end of the long straight corridor. There is a special droid that talks to you and tells you that he wants to leave the Sith world because he doesn't agree with killing people. He then asks you to help him by shutting him down.
This will give you a lot of light points and a lot of experience.
Infinite Health
For Infinite Health press start, then scroll to the right using the "R" button until you reach the Level Up screen. But you have to be able to level up manully! Then press level up. After that press the white button on your controller. Then a text messager should come up with a word bank. Simply press "A" to type in a letter, and use the "R" and "L" buttons to go side to side to choose your letter. Type in "YODA'S ROBE", then press the white button again to enter the cheat. Then you should hear a lightsaber. Cheat Complete!
Voice Change
With your primary controller plugged into the first port, plug a second controller into the fourth port. At any time, you can use the second controller to change the pitch of the voice acting.
Black Button: Lower pitch (Barry White)
White Button: High pitch (like Michael Jackson)
Watch Hidden Ending
Plug two controllers into your Xbox. Outside the doors to the final battle with Malak (don't open them!), push down both triggers and press the Y Button on both controllers at the same time. You'll need a third hand or a friend to pull this off.
Infinite Experience
In the dueling room on Korriban, there's a computer that lets you fight prisoners. Once you get your computer skill to the level that allows you to use 0 spikes to Hack Into Security Cameras or Hack Into Sith Database Files, just select that choice a few times and when you exit the computer interface, you'll get a load of experience.
Null Item Cheat
Before selecting a player, press X, X, Y, X, R, X, START. This doesn't work for point races.
Infinite Health, Spikes and Stims
Go to the Ebon Hawk and put all your medpacs in a Ebon Hawk storage container. After that talk to Jolee and have him make you more medpacs. Repeat this as many times as you want. And it is also a good way to earn credits.
Double Experience
If you've discovered the secret bounty organization, then no doubt you will have been assigned a mission involving killing a slave trader named Zuulan as part of your initiation into the society.
When you find Zuulan's speeder, select the option which sets off his alarm. Zuulan and his thugs come running, and no matter what conversation option you choose, combat is the end result (remember that you MUST BE ALONE for these missions).
Instead of attacking your assailants, choose to "use" the speeder again, and this time select the option which affixes the frag mine to the hull of the craft. As a result of this, you will kill the Zuulan who comes running out to his speeder and gets blown away by your bomb, but at the same time, a second Zuulan and cronies is spawned very near by. Pick up the credits and equipment off of the dead Zuulan and then round the corner to engage in conversdation with the other Zuulan and kill him as well (an easy battle).
You'll get twice the stuff and twice the XP, plus if you're a light sided character who needs the credits, you don't gain the extra dark side points for killing him! It's a win-win situation.
Get On Stage
Want to get on stage with the musicians in the Upper Taris Cantina? Of course you do. To manage this trick, walk against the corner of the stage and press the Black Button several times. This cycles through party members and will end up popping one of them on stage. Now sing a song for all the word.
XP Plateau
A legitimate manner to gain XP is to hunt the Dune Seas of Tattooine. The Desert Wraids are bountiful and come in packs of 4. You'll earn about 2000 xp after each pack. When you're done with them, simply use the map function to go back to the Ebon Hawk, heal, and return.
Wave Your Lightsaber Around
Once you get a lightsaber (or two) press Y at any time it is equipped but disengaged to make the light sword appear. Continuing to press Y will make it look like your character is attending a rave.
Tach-nastics
On Kashyyk, in the Shadow Lands, if you run into a Tach, "speak" to it, and it will do a little flip. Not very helpful, but kind of cute.
Easy Path to the Light Side
On the Planet Dantooine, Once you recieve the mission to travel to the Sandral estate. Go to the Sandral Estate, Talk to the droid and you represent the council. Once inside, the head of the estate approaches you. Once hes done talking to you the daughter approaches you. First say to her, ''What i do is my own business''. You'll recieve dark points at first, but talk to her again. Apologize, then choose either of the next options, then she'll tell you her name then say, ''I dont have time to listen to this.'' Light side points gained and keep repeating from ''Apologize'' to gain LS points.
Easy Dark Points in Dantooine
Talk to Mr. Matale, in the end, when he offers you a bribe, demand 2000 credits, and you'll get dark side points. Once he goes back into his estate talk to the droid to get him to come back out, simply repeat the process until you receive an infinite amount of those beloved Dark Points.
Easy Dark Side Points
Once you have found Sasha in the Ebon Hawk, tell her to go away. Keep saying go away. Once she starts to run away, catch her before she can leave and repeat this process. If she gets too close to the door, say ''A little girl? How did you get in here?''
Then say ''Don't worry, I won't hurt you.''
Then, ''Err....okay, whatever you say.''
Repeat this whole process until you have the level you want. I did this and it took about 5-10 minutes to turn completely dark from about 3/4 down. You can only do this when you talk to her the first time, before you get off the ship on the next planet.
Keep the Sith Armor
Once you obtain the armor and complete the associated quest, equip it to another party member when you select the option of handing it over.
Keep the Sandpeople Robes
Once you obtain the robes and complete the associated quest, equip it to another party member when you select the option of handing it over.
Fun with Bastila's Wardrobe
Equip Bastila with dark robes and then remove them to see her in slightly different underwear.
Galaxy Droid Superglitch
Okay, this only happened to me once, and I'm not sure why, but after leaving Tatooine, with a job well done, Carth, Bastila, HK-47, T3-M4, Mission, Zalbaar, Canderous, Jolee and Juhani were stationed in the center of the Ebon Hawk, like in the Star Forge. The map displayed the Leviathan interior, and in the cockpit was a Galaxy Droid. All he said was "Where would you like to go?" Here are the options:
Endar Spire (It doesn't load, but is nice to know)
Taris (Show the Sith some new strength!)
Dantooine (Wasn't that blown up!?)
Tatooine
Manaan
Kashyyk
Korriban
Mystery Planet (Lets hope this doesn't happen early in the game)
Star Forge (Sure! Just beat it now! Waste $30!)
It's really weird, and I don't know how to activate it.
Davik's Estate Made Easy
To get through Davik's estate in less than ten minutes, first, go through the door to the throne room (To the right from where you start out.). Now go through the door immediately to your left. Follow the corridor until you find the guard room. Kill the guards and go up to the console. Slice it and go to the security cameras. Select Hangar from the list. It will go to the Camera, press A to go to interface. Select disable hangar security. Now log out. Now exit the guard room from the door the guards were in front of and turn left. Open the hangar door and kill Davik to finish Taris.
Get Star Map Easily
On Dantooine in the ruins, instead of fighting the guardian droids, you can ignore them and get to the Star Map. First, have only Bastila in your party. Then when you go into the first door in the ruins, go into solo mode. Bastila will stay behind while you talk to the droid. Talk to it, and go into the proving grounds. Run past the droid and use the console. If you go into combat mode, simply press B to turn it off. Now run into the next room and repeat. The door to the Star Map will be open, and you can go in. Run to the Star Map, still ignoring the droids. After the cutscene, go back to where Bastila was left and turn off solo mode. Then run through the door and you're done on Dantooine.
Alter Voice Pitch
Attach a second controller into controller port 4 on your Xbox. Use the black and white buttons on the second controller to alter the pitch of all of the characters voices.
Easter Egg Ending
Attach a second controller into controller port 4 on your Xbox. While standing outside the door which leads to your final battle with Darth Malak, press and hold the L, R and Y buttons on both controllers. Now open the door and speak to Malak. Watch what happens after your conversation ends.
Easy Money
Have Zaalbar make you grenades, T3 make you programming spikes, and Canderous make you stimulants. You can then sell these things to different merchants you encounter.