just go here using your psp web browser and you can play. its pretty fun imo http://www.freetetris.org/
Thanks for the link man. I can never find cool games for my PSP where I dont have to downgrade or like convert a bunch of stuff.
Dunno if I can talk about it, but there is an exploit in Lumines that can be used with PSP 3.50; but it there isn't much homebrew for it yet. EDIT: Yes, you can downgrade 3.5 if you have Lumines now.
Only if you put licensed games on it. If you use homebrew, games made by our fellow users, then its 100% legal. Also, new motherboards dont matter anymore. As long as your PSP is 3.03 and lower, you can downgrade to use homebrew.
Yep, I just found out yesterday that 3.5 can be downgraded as well. All you need is Lumines 1 Im sure you can find out how if you search Google