Help playing games?

Hello,
I just downgraded to 3.03oec
and I downloaded Killzone
I was wondering how to play it.
What files do I put in what?
Sometimes the notice says "the game cannot be played"

Thank you

So you should have a .ISO or a .CSO file. Make a folder on the root of your memory stick called ISO, and put all games their. Root of memory stick is the PSP, MP_ROOT, and other folders are.

did u put a umd in ur psp

Hey thanks for the help guys.
The method you wrote works, but what about a game that doesnt have a iso or cso?
It has SYSDIR and USRDIR folder
PSP folder and inside is GAME and (Worms and Worms %)

you have to extract the Worms and Worms % folders using winrar and put them
in your GAME folder.

or if u are using winzip then extract to desktop

Hey thanks for the help guys.
The method you wrote works, but what about a game that doesnt have a iso or cso?
It has SYSDIR and USRDIR folder
PSP folder and inside is GAME and (Worms and Worms %)

You need to use UMDGen and compile a ISO out of those files.

Where did you download Killzone from..?