Cheats and Hints

BellaOnline Myst 3: Exile Walkthrough
Complete walkthrough, with hints on getting through the difficult areas.
http://www.bellaonline.com/gaming/w/myst3/

Exile-hints
Age-based walkthrough for the game. Choose from different levels of hints from a concise and spoiler-free guide to a complete decomposition of the puzzle.
http://exilehints.bwweb.org

GameSpot: Myst III: Exile Game Guide
Professionally designed walkthrough written by Doug Radcliffe.
http://gamespot.com/gamespot/guides/pc/myst_3/

Low-Spoiler Guide to Myst 3: Exile
Hints and a walkthrough with an emphasis on pointing gamers towards things they might not have tried, not divulging the solutions.
http://www.angelfire.com/hero/tjekanefir/exile.htm

Myst III: Exile Walkthrough
Walkthrough with many screenshots and advice for installation problems, by Linda Shaw and Norma Kuderna.
http://home.satx.rr.com/adventuregamers/myst3exilewt/MYST3WT.html

UHS: Myst III Hints
Gradual Universal Hint System hints.
http://www.uhs-hints.com/uhsweb/myst3.php