I downloaded GTA III about a month ago and I also have the title for my PS2. Wasnt until I was played my PS2 recently, I noticed something missing in my Xperia Play version. If you hve it, just take a look...maybe its just me.
1) Lights on vehicles dont work.
2) Walls around parking lots and on sides of some roads arent there visually however you or a vehicle will react as if it was
3) (this is probably a feature purposely left out) you can't do drive by shooting
Little quirks but most (like invisible walls) are a mission by mission inhibitor. (driving fast while being tailed by cops and you smash into a wall.)
No complaining just curious if its a download issue either by me or by phone because my friend with a SGSII has lights!
Its been updated but like the other poster said you may lose progress unless you find that file on your SDcard and save it then put it into the newly downloaded library Google the pc version to find out how to do this