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The Portopia Serial Murder Case (NES)

Portopia Renzoku Satsujin Jiken NES
Genre: Adventure
Perspective: 1st-person
Gameplay: Interactive fiction / text adventure, Puzzle elements
Narrative: Detective / mystery
Published by: Enix Corporation
Developed by: Chunsoft
Released: 1985
Platform: Nintendo (NES)

Kouzou Yamakawa, president of Loan and Savings, was found dead in his mansion. Despite all the evidence suggesting it was a suicide, a detective (meaning you) and his assistant arrive on the scene to investigate further.

Finding clues, solving various puzzles and talking with different characters, you need to unravel the mystery of the murder.