The game features flexible options and an acceptable Japanese parser (noun + verb order; quite similar to mid-late Scott Adams's parser).
A unique approach to reproducing the "detective on site" in the game.
Simply a true classic masterpiece.
There is no "simply for the sake of the game" element which often can be seen in games of this era - it strives to be strictly demanding, requiring deep insight and logic in equal measure.
As in real life, you need to find physical evidence and then bring in suspects for interrogation.
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