While Killzone: Liberation didn’t take PSP Game of the Year honors, it still has a legion of fans that love its action-packed top-down gameplay. If you missed this game last year, now’s your chance to try a sweet downloadable demo.

YourPSP users:
Connect your PSP to your computer and visit Killzone.com. You will be able to download and install the demo automatically.

Everyone else:
1. Download the demo ZIP file.
2. Extract the contents of the ZIP file.
3. Connect your PSP to your computer using a USB cable.
4. Go to the PSP/GAME folder.
5. Copy UCES00279-Demo folder into directory.

Source pspfanboy.com