somewhone says that you could put batlle to hard easy or normal but how>\?

It's done from the main menu I think. Click on options.

 

Don't bother changing it though, it's pretty much all the same. The game's to easy.

First of all, its not the same. the enemys do much more damage when they are on hard. MUCH MORE.

A challenge is a good thing.

I know the ultimate hardness level. Put difficulty all the way up, don't use any armor or clothes, no weapons, no stims/med pacs/ect., and no Force Powers...

The only difference between Difficult and Normal is that in Difficult enemies deal 150% damage against 100% in Normal...

 

That's it...

requirements to open locks and pick up and set mines are also raised.