After my harddrive crashed awhile ago I checked out some old backup cd's and found Hidden Evil on it
Hidden evil is a addon for Half-life which was my first attempt at half-life mapping several years ago. I was working and learning same time on this addon. At that time I did not had internet and released it maybe year after it was finished, but I did send it to PCZone of The Netherlands and it got onto cd for there magazine.
This addon has 20 maps with in the end kind of interactive movie in which you have to walk in third person to do something, so you are warned. I did not forgot to switch back to first person that I readed in a amusing review you can find below
http://tenfourmaps.telefragged.com/php/review.php?gameid=hl&levid=hidden
Note: This addon is not supported anymore by me. Please don't mail about bug fixes and changes, thanks.