I first played Mercenary when I was a kid, with a pirate copy, and found it good but boring once all the buildings were destroyed!
Until I understood there was much more than this, and finally found how to get inside the underground complex. I got hooked, played all the sequels like crazy and decided, by playing Mercenary III, to start a website about it.
I got in touch with many former Novagen employees and all were incredibly friendly.
I am sad there was no more sequels, and no more games like these, with total freedom, multiple ways to win, and humour.
BTW I now own multiple legal copies!