okr on 30 May 2010
From the titles in the OP it seems you are from Germany or Austria, so maybe this site will help you: http://www.zimmer101.de/wii-spiele/spielegenres.html (as far as I know the guy who manages this site is a VGC member).
As you already have the point&click adventure Geheimakte Tunguska (Secret Files outside the German speaking area) in your list, which is a good choice imo, I recommend to put Geheimakte 2: Puritas Cordis (Secret Files 2) on the list as well.
An even better p&c adventure which would be good for a public library imo is the classic Broken Sword: The Shadow of the Templars - Directors Cut (Baphomets Fluch in GER/AUT).
