There are many ways to obtain free psp games.
Try searching for the keyword "Free PSP Games" on the search engines and for sure bunch of results will come up one of them is my favorite which is Full PSP Games Free Download
Please take note that your PSP should be on Custom Firmware before you will be able to play the games. You may ask what a custom firmware is. Well it will be a long story but to give you a quick idea.It is the software or the system that run's the device like an Operating System of a typical computer e.g. Windows XP that is designed for the PSP Console only.
When you buy a PSP it is preloaded with a Sony Official Firmware where playing saved games downloaded anywhere on the internet is not possible and you should be aware that it is illegal doing so. But if you really want to know then I will give as much idea as I can but I again it is illegal and I should not be held responsible for any act of misuse of the information provided here this is solely intended for information purposes only.
There are requirements for you to be able to play Free PSP Games on your PSP.
1. Your PSP should be hackable - this means your PSP should not be one of those PSP 2000 with TA088v3 motherboards, PSP 3000, and PSP go - (you can download games with this device but not for free)
2. For PSP 2000 with TA088v3 and PSP 3000 there is a solution but another requirement is needed where the default firmware should be 5.03 above that no chance of playing saved games.
3. If you've met those requirements we are good to go. If not then there is no sense to continue reading.
4. Assuming you have a PSP 2000 w/ TA088v3 motherboard and on 5.03 Official Firmware or a PSP 3000 with 5.03 OFW
The files you need: ChickHEN R3
5.03 MHU Custom Firmware Enabler 3.70
The rest of the tutorial can be found here...