hmm just beeing curious right now...
so how did they find out that lumines accomplishes the exploit? i mean did they just try random games and than suddenly it worked with lumined?
Well, Lumines is one of the best selling PSP games so it makes sense that they chose it first to try and find an exploit. It's likely other games have a similar exploit, but HEN would have to be rewritten for another game.
Do you have a GameStop or EBGames nearby? Should be able to find the original Lumines there.