Zelda's Adventure

CD-i Collective
Contains review [4/5], screenshots, and video.
http://www.geocities.com/gdraxa/zadv/

GameFAQs
Includes walkthrough, FAQ, review, and message board.
http://www.gamefaqs.com/console/cdi/data/564215.html

Ganon's Tower
Contains review, screenshots, and tips.
http://www.ganonstower.com/zldadv.shtml

Online Video Game Atlas - CD-i Maps
Includes graphical maps.
http://www.vgmaps.com/Atlas/CD-i/index.htm#Z