Murder mystery doesn't nessessarily mean "whodunit." A whodunit mystery would have to have a group of people confined in one setting, usually a mansion or something along those lines, of which one of the persons is a killer. The detective of the group must find out whodunit, usually too late to save most of the people from getting killed.
So really the only whodunit games I can think of are the Laura Bow series and Cruise for a Corpse.
|