Enter "ATENVU" as a code.
Defeat Obi-Wan on the Jedi difficulty setting to unlock the master difficulty setting for Anakin.
Defeat Anakin on the Jedi difficulty setting to unlock the master difficulty setting for Obi-Wan.
When Count Dooku attacks, block it then immediately afterwards hit him with an attack. If you are having trouble blocking, keep the following information in mind. Holding the lightsaber behind him is a forward attack, same with in front. Holding the lightsaber under him is an upper attack. Holding the lightsaber above him is an under attack, and hold R when he is charging to absorb.
In Act 1, get the laser walker to stand above you. Then, keep upslashing his head until it is destroyed. When it explodes, it will hurt you; get away.
It will first shoot lasers and the cannon. Wait until the cannon target flashes under you, then jump backwards. When it shoots its lasers, press L to deflect them back at the tank. When you blow out the laser, it will use a machine gun and cannon, which you cannot reflect. However, you can block it so that when you reflect the never ending supply of droid lasers, they will not hit the droids but instead hit the tank. Keep doing this until the tank is destroyed.