Zarfhome: System's Twilight Author's page about the Macintosh puzzle game in the style of 3 in Three and The Fool's Errand. http://www.eblong.com/zarf/twilight.html

IF-Review: The Tale of the Reviewer Review with spoilers by Gunther Schmidl. http://www.ministryofpeace.com/if-review/reviews/20010216.html

Clan MacGaming: System's Twilight Review "System's Twilight is completely worth the download... that is, if you think you're a genius." By Samuel Marcus. http://www.clanmacgaming.com/articles.php?read=111

Freshmeat Contains project details and user ratings. http://freshmeat.net/projects/crack-attack/