Description from MobyGames:
An adventure game in the style of [Myst][1], Riddle of the Sphinx
places you in the role of a close friend of Sir Gil Blythe Geoffreys,
an archaeologist who as recently uncovered some remarkable finds about
the Great Pyramid and the Sphinx. His discoveries have doomed him with
a curse, however, and its your duty to right the wrongs he has
uncovered. Taking place in the near future (after the Egyptian
Antiquities Organization apparently closed off the sites to the
public), you will uncover secrets that have been buried for ten
millennia.
Hybrid Mac/PC CDs saved as .iso images, compressed with Stuffit 5.5
Compatibility
Architecture: PPC
Requires a PPC with Mac OS 8 or more (at least G3 recommended)
32 MB available RAM
14 inch monitor/thousands of colors (16 bit)
QuickTime 5.0 or greater
[1]:
http://macintoshgarden.org/games/myst