Hints and walkthrough
 

Found two links if your stuck in this game.

Hint booklet
http://faqs.ign.com/articles/594/594692p1.html

Full walkthrough
http://koti.phnet.fi/fuljas/solves/GW1.SOL

Hope this helps (i was stuck myself at a certain point and actually needed to peek in the walkthrough)

The official hintbook can be downloaded from here, in the extras section of the review page--at the top, left of the screenshots.