WOW: This has suddenly turned into a competition complete with an ad hominem attack on me!
My strategy for you to follow is simple and straightforward and need not be complicated by anyone else's interpretation of what I propose:
1. In case Rosetta has become corrupted, reinstall it! Simply checking for its presence will not tell you if it is not functional due to corruption. Reinstalling Rosetta is a simple task (as detailed in my earlier post) and does not involve anything complicated, like using Terminal (which if used incorrectly can render your iMac unbootable!).
Once you know that a non-corrupted version of Rosetta has been installed, then run Software Update, just to be sure you have all the updates available for Snow Leopard, AFTER the reinstallation of Rosetta.
If Indiana Jones and the Emperor's Tomb now runs properly, problem over! If it does not:
2. Download a long cherished PowerPC program known as Appleworks (at the link I posted above), which is now available for a free download from Apple. If it runs correctly, then you know that Rosetta is operating properly.
If at that point your applications, such as Indiana Jones and the Emperor's Tomb runs; problem solved.
If it fails to run you now know that its failure is NOT a problem of Rosetta and is MOST LIKELY due to the fact that it was released in 2003, when OS X 10.2.x was the prevailing operating system.
There is no guarantee that a program written for OS X 10.2.x will run in Snow Leopard OS X 10.6.8, and many require a patch or update to do so.
Others may find that too complicated to suggest to you; I find it too simple!
GOOD LUCK!