Star Wars Knights of the Old Republic II: The Sith Lords

Attack While Stunned
Well, if an enemy has used ''Insanity'' or ''Stasis'' or another move that causes you to freeze and not be able to attack, you can push the White button, pausing the game. Now, switch to different characters and give them new commands, such as using medpacks, or attacking, or something of the sort. Go back to the character that you paused on, and un-pause. Your party should perform what you told them too, giving you a helping hand during a losing battle. You will go back to your frozen position after the first action is performed, but you can just pause, and re-select or select some more, and they will perform those also.
(Thanks to kimsue3@wk.net)

Bastila in Ending Sequence
Whilst playing on the Light side, in the Star Forge when Bastila asks you to kill her, do so then defeat Malek. When the celebration sequence begins, Admiral Dodonna gives you the medal, then the screen backs up and Bastila is there, although you killed her. Also, Juhani is wearing the Star Forge Robes even if that is not what she was wearing before Malak's death.
(Thanks to kimsue3@wk.net)

Beat Any Boss
To defeat any boss and take no damage, attack the opponent. When the attack is done and you have successfully given damage, pause the game, save it, and load the game you just saved. It will instantly be your turn and you can keep this up and beat any enemy/ boss without letting them attack once.
(Thanks to kimsue3@wk.net)

Dak Vasser Glitch
When you talk to Dak Vasser in the Valley of the Sith lords with Juhani in your party then let him leave, you find him in the Korriban cantina. Tell him you will not let him leave. Then kill him and take his belongings. Leave the area, then return to find he is still there.
(Thanks to kimsue3@wk.net)

Double Bendak Blasters
To get double Bendak Blasters (and extra money), go through the Arena quest and make your way to Twitch. Defeat Twitch, and instead of talking to the Hutt to get your money, talk to Bendak and get the Deathmatch. Then, talk to Ajuur and he will talk about bribing officers and not give you the money. Leave. Return, then talk to Ajuur to fight Bendak. When you kill him, talk to Ajuur again to get the 700 credits and Bendak Blaster. Talk to him once more and he will act as if you just defeated Twitch, but a "700 Credits" and "Item(s) Received" message will appear. Check your items and you will have two Bendak Blasters.
(Thanks to kimsue3@wk.net)

Duplicate Bastilla's Lightsaber and Gain Extra Experience
To do this, you must have agreed with Kandon to ride in the swoop race for the Black Vulkars. Go back into the Vulkar base, steal the Prototype Accelerator and bring it back to the Beks. After you have raced, won Bastilla, and have returned to the Upper City with her, you must put all the items you have collected from the battle in to the foot locker next to the work bench in your hideout each time. Otherwise, the duplication of the items will not work. You can now go back to the Lower City and tell Gadon's Bodyguard that you have the Accelerator again. You will then be able to go to the swoop track again. It will appear as if Bastilla has just escaped from Brejik. You can then talk to her and she will act as if you just rescued her. After your conversation, you will return to your hideout with: Bastilla's lightsaber, Brejiks Arm Band and Belt, and 525 experience points. However, your game will not be reset. You can repeat this trick as many times as desired before leaving Taris.
(Thanks to kimsue3@wk.net)

Duplicate Items with Zaalbar
n order to do this, you must have not yet completed the Kashyyyk main quest.
Bring Zaalbar out with you onto the planet of Kashyyyk and equip any items you want duplicated on him.
Before approaching the gate to the Wookie village, save the game and then remove all items that Zaalbar has on him.
Proceed into the cut scene.
Complete the mission, either light or dark, and get Zaalbar back into your party.
All items you removed from Zaalbar will be in your inventory and he will also have them on his person, thus, being duplicated.
(Thanks to kimsue3@wk.net)

Easy Dark Points in Dantooine
Talk to Mr. Matale at the end. When he offers you a bribe, demand 2000 credits and you'll get dark side points. Once he returns to his estate, talk to the droid to get him to come back out. Simply repeat the process until you receive an infinite amount of dark doints.
(Thanks to kimsue3@wk.net)

Easy Dark Side Points
Once you have found Sasha in the Ebon Hawk, tell her to go away. Repeatedly tell her to go away. As 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. Note: You can only do this when you talk to her for the first time, before you get off the ship on the next planet.
(Thanks to kimsue3@wk.net)

Easy Money
When you are on the Ebon Hawk, talk to Canderous and ask him for stimulints. Keep asking for them until he won't give you any more. Sell the stimulints and go ask Canderous for more. Keep doing this until you have the desired amount of money.
(Thanks to kimsue3@wk.net)

Easy Path to the Light Side
On the Planet Dantooine, once you receive the mission to travel to the Sandral estate, you go to the Sandral Estate, Talk to the droid and you’ll represent the council. Once inside, the head of the estate approaches you. Once he’s done talking to you, the daughter approaches you. First say to her, ''What I do is my own business''. You'll receive dark points at first, but talk to her again. Apologize, then choose either of the next options, she'll then tell you her name, then say, ''I don’t have time to listen to this.'' Light side points gained and keep repeating from ''Apologize'' to gain LS points.
(Thanks to kimsue3@wk.net)

Forcing Enemies to Skip their Turns
NOTE: This only works with enemies that have melee weapons (ie. not kathhounds) and usually enemies without lightsabers.
Running up to an enemy forces them to take out their melee weapon. Run a short distance away (not too far or else they will take out their ranged weapon again) and select rapid fire. You fire on the enemy while they spend their turn running after you, not allowing them to attack you at all. The best place this works is in the duelling pit (ie. one on one battles).
(Thanks to kimsue3@wk.net)

Free Entry into Ahto City
This glitch gets you into the city without going through the pay station ( ie. you don't pay a docking fee).
To do this, after leaving the Ebon Hawk on Mannan, head toward the private hangar. Stand outside the private hangar door, and attempt to pick the lock. This will fail. Push right up to the door and then go to your character selection screen. Select any new character into your party and they should appear on the other side of the hangar door. With this character kill all the enemies beyond the door, then go to the transporter and select it. It will ask if you want to travel to the sith base. Answer yes and enter the base. When inside the base, you can leave through a door inside and this takes you into the city. The only down-side to this trick, is that you can only get into the city through the sith base, and you can only leave through the quick Transit System, but it saves you 500 credits.
(Thanks to kimsue3@wk.net)

Fun with Bastila's Wardrobe
Equip Bastila with dark robes, and then remove them to see her in slightly different underwear.
(Thanks to kimsue3@wk.net)

Hidden Ending
Note: You need two controllers for this.
Before the final battle with Darth Malak, press the L & R Triggers plus the Y Button on all controllers that you have plugged into the Xbox. (It's recommended to have the primary controller in port 1 and another controller in port 4.) This must be done before you enter the door to face Darth Malak. You'll know if you did it right, if your Jedi takes out her/his lightsaber. Then, open the door and walk up to Malak and talk to him.
(Thanks to kimsue3@wk.net)

Huge Game Hour Count
Save before going into a cut-scene (eg. when you take off in the Ebon Hawk for the first time). Immediately the cut-scene starts, quickly turn the X-Box off, then on again. Your game will automatically resume a few moments later at the cut-scene. When you next save, a huge sum of hours will be added onto your time.
(Thanks to kimsue3@wk.net)

Infinite Dark Side Points on Manaan
After you've returned from the Secret Kolto Base on the ocean floor, you'll be confronted by Roland Wann. He'll ask you what happened. Tell him what happened. Now, choose the option that will keep you quiet.. He'll tell you that's ridiculous and the conversation will end. Talk to him again and select the same item. Each time you'll get a Dark Side point.
(Thanks to kimsue3@wk.net)

Infinite Experience on Korriban
If you go to the upper level where the duelling arena is in the Sith academy on Korriban, there is a computer where you can "Read data files". If you keep doing this, you can gain as much experience as you want. Note: you need computer spikes to do this or a very high computer skill level. This can only be done before you do the sith trials inside the catacombs.
(Thanks to kimsue3@wk.net)

Item Duping
To dupe any equip-able item, just do the following:
Go to the submarine base on mannan.
When you get in the base, go to one of the air locks (it doesn't matter which one).
Equip anything you want to be duped (swords, armor, gloves, implants, etc).
Save your game.
Un-equip everything that you just equipped on your companions.
Exit through the air lock.
When in the water, go right back inside.
Your companions will now be wearing everything you just took off of them.
(Thanks to kimsue3@wk.net)

Keep the Sand People 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.
(Thanks to kimsue3@wk.net)

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.
(Thanks to kimsue3@wk.net)

Not Earning Dark Side or Light Side Points
Sometimes when you end a conversation, you can gain light side or dark side points. To not earn these, simply after ending conversation, press Start and save game, very quickly. After saving, load the game and you shouldn't have earned any light/dark points. For example, in the duel rings of Taris, when you fight Bendak, to not gain any dark points, save/load after commentary and you haven't gained any dark points.
(Thanks to kimsue3@wk.net)

Quick Money on the Ebon Hawk
On the Ebon Hawk, ask Mission for a security spike. She will give you one whenever you ask,and you can keep asking. When you have the maximum amount, sell them and come back and ask her for more.
(Thanks to kimsue3@wk.net)

Quick Money with Grenades
Get the grenades made by the Wookie on your ship, and set yourself on any planet with a store. Sell the grenades, then go to the Wookie for more. Repeat this over until you get however much you want.
(Thanks to kimsue3@wk.net)

Unlimited Experience
You’ll need a lot of time and patience to achieve this.
On Korriban, inside the Sith Academy, you'll find a student you've met before who seems to be having problems with the Academy. After a little conversation and coaxing, he'll admit he doesn't feel right at the Academy. You'll then be able to suggest a choice of three paths. If you suggest the Jedi order, you'll get 500 xp and he'll leave. If you suggest he stick it out, you'll get 100 xp and the conversation will end. If you simply suggest that he leave and don't take a specific path, he'll get up to leave and you'll get 300 xp. As he's leaving, you can stop him and talk to him again and start the whole thing over again. Keep doing this and you'll receive 300 xp each time.
(Thanks to kimsue3@wk.net)

Unlimited Credits, Lightsaber Crystals, and Jedi Robes
Talk to Dak Vessar on Korriban near the first tomb on your left, while Juhani is in your party. He will go to the cantina. Switch Juhani out of your party. Talk to Dak and tell him that you will not let him leave. Then, fight him. Save the game and load it after you have killed him. You can keep doing this for as long as desired to get credits, a Lightsaber Crystal, and a Jedi Knight robe each time.
(Thanks to kimsue3@wk.net)

Voice Modulation
Note: You need two controllers for this trick.
With your primary controller plugged into ports 1, 2 or 3, have a second controller plugged into port 4. While playing the game, press the black or white button on the second controller to raise and lower the pitch of the in-game voices.
(Thanks to kimsue3@wk.net)