During the game, hit BACKSPACE, type the code in the red box, then hit ENTER. Most of the codes toggle the effect (type it in the first time to enable the effect, repeat it to disable it). Don't type the quotation marks when you enter the codes, but be sure to include any spaces if they're included in the list here.
When you start the level go to the left. There you will find three men who will start shooting at you. Kill them. When done killing them, go to the left through a cave. In the cave you will find a Sandcrawler. Kill the Sand People. Through a door to the right, it will look like a gate. Open it. In it is a blaster with 250 rounds, and a R2 unit. It will lead you out of the Sand Crawler. Protect it with your life and it will lead you to 5 Flash Grenades.
When you are in the city of Theed and you come across an injured soldier asking for water, do about a 180 turn (turn right behind you) and there will be a piece missing from the banister on the bridge. Jump down from there then go along the path up the stairs and in that room will be a flask of water, health, and a force field, just like the ones the destroyer droids have.
When you are fighting Darth Maul during the final battle, there is a panel on one of the side walls that doesn't match the pattern of the other ones. Go up to it and press the spacebar and there is a full health power-up available on both sides of the bridge.
In the final battle there is a much easier way to kill Darth Maul then just hit him with a lightsaber a bunch. Simply get him between you and the pit and continously force push him towards it. He will soon fall in and die.
When you first get into the level with the podrace (after you get the parts and find jar jar on mos espa) don't go into the market place yet. Instead, walk out and go to the right. If you keep going there will be some alien men there that will say "get him!!!" Kill them and then in the wall of the canyon you will find a path way. Just follow it through and there will be sandpeople there so you need to kill them. In the sandcrawler you will find health and a blaster.
Enter: iamqueen (for the queen), iampanaka for Anikan), iamquigo (for Qui Gon Jin), and iamobi (for O.B.1) to switch your current character.
The easy way to beat Darth Maul the first time on tatooine is if you have a loaded blaster to start shottng at him while slowly retreating he will eventually give up and run Follow him to the ship and repeat the above steps until the ship lifts off