Case Closed (1996)

Season 8

Episode 21: The Mysterious Retro Room Case

Mouri, Ran, and Conan are attending a dolphin show when a murder occurs in the hotel. The hotel room where the murder occurred was specially designed to be retro one. The clue to the murder is an automatic television that when inserted with a coin, will play for an hour. Conan reveals how the culprit used that to fake their allibi.