Star Wars: Republic Commando Cheats

Defeating Greivous' Guard
Use your EMP grenades and concentrate your men's fire on them. Once they are being shocked by the EMP, throw Thermal Detonators to deal extra damage. You should also use your DC-17's anti-armor attachment.

Defeating SBDs
Throw two electric grenades and fire a quick bust from the DC-17. This should shut them down or put them on the ground.

To defeat a Super Battle Droid, run up to him while he is shooting at you. Then melee him and back up before he can hit you. While he is swinging his arm, fire at him with your blaster. After he melees, he will resume shooting at you. Repeat the process until he is destroyed. If there are two SBDs, concentrate your team's fire on him.

Get your squad to attack the Super Battle Droid. Then, take out a sniper rifle and shoot them where there face would be. Take out the arm that does not have a blaster. Then, take a few more shots on its upper body.

Ghost Ship Recon: Lightsaber
On the level where you first encounter the Trandoshan Elites (the ones with the minigun), just before you find the elite there is some debris you can blow up. Instead of doing this, turn right and crawl into the vent. Once you get inside, look behind you. You will see ad ead clone with a lightsaber. Note: You cannot use it.

Ghost Ship Recon: Save ammunition
When you are on the ghost ship, you will not find any D-17 ammunition for awhile. Save it and spread all your ammunition around. You will get a shotgun type weapon during the game that is average, but not as good as the D-17. Also make sure that you have a sniper and ammunition for the droids.

Walking turrets
In the Wookie level hanger, enter a gun turret. Use the [Left Analog-stick] to slowly move the turret around the hanger. You can even take it off the edge of the platform. You cannot fall off, even when you get out -- you will return to the platform.