Problem with ProjectX or Shadow of the beast or all those beautiful demos is there is just one way to play them and finish them. So you rather find them too easy (means I know where to be and what to do at the right time) or impossible to achieve and pointless. I wish all those game developpers were more game designers than demo makers
Team17 was one of the worse for that and we didn't have enough Archer MacLean or Geoff Crammond around.
To be back to the topic I would say Gold of the Aztecs...
One of the worse frustrating experience with a game