Suspect

Suspect is an Infocom mystery game. It resembles Deadline more than Witness or Ballyhoo. You are at a party with a large crowd of people, and you are set up for the murder of the hostess.

This game features a large number of NPCs with independent actions. You have to figure out who committed the murder, and we, and who helped them.

Overall, it seemed difficult, but I just used a walkthrough after playing around a bit. I don't enjoy replaying long games over and over, (except for Adventure and Zork I, where you really just need to optimize your lantern use). The story was fun, and I enjoyed the feelies.

The game does give you clues on the actions you need to perform, usually by seeing something happen and saying to yourself "Oh! If I had done such and such EARLIER, I would have been fine!"