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I recently discovered DosBox which you can use to run old dos games; I have now old sierra classics (Leisure suit larry 1, space quest 1 etc) running on my PowerBook G4 :) But I guess you could also run the (dos version) of tomb raider as well...

See: http://dosbox.sourceforge.net/
 
I understood that :) However, several old pc games are free for download nowadays. Perhaps that goes for tombraider as well... it shouldn't make any difference for your gaming experience if you're running the dos or the mac version except for harddisk usage (a 25 MB DosBox emulator compared to several hundreds of megabytes for a complete classic environment).

Also, another nice app is the ScummVM. An application to play old Lucasarts adventure games (indiana jones, maniac mansion, monkey island, etc) on your mac: http://www.scummvm.org/
 
Since you have an Intel Mac, you can't run classic apps on your computer. If it's for Mac OS 9 or earlier, you can't play it.
 
Rosetta is converting Mac OS X PPC apps, letting them run on Intel. Mac OS 9 was an entirely different operating system. If your old games have an update, to let them run in Mac OS X, then yes Rosetta will work. If they were never supported in Mac OS X, you'll need an old PPC computer to run them.
 
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