Beneath a Steel Sky is released free so if you don't want to spend money this is the game you should try. You can probably find Lucas Art Games on Ebay. I would start with Monkey Island 1 wich is an fantastic game. Other games worth trying (and that I have tested on my PSP) is:
Monkey Island 2
Zak McKracken
Maniac Mansion
Indiana Jones 3 & 4
Broken Sword 1 & 2
Loom
Really almost every game that works in ScummVM is worth trying.
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