Looking for the number of episodes of Detective Conan that contain secrets.

Hello, I am a member of the Conan Bar team. I am very happy to answer your questions^_^

The dramas related to tunnels and secret passages in "Detective Conan" Sets include:

107. The Mysterious Incident of the Mole Planet (Part 1)

108． The Mysterious Incident of the Mole Planet (Part 2)

The murderer used sewers to move, which can be considered a tunnel in modern cities = =

136. The Blue Castle Exploration Incident (Part 1)

137． The Blue Castle Exploration Incident (Part 2)

188. A Dangerous Resurrection: Detective Team's Disaster in the Cave

189． A Dangerous Resurrection: The Wounded Detective

The detective team encountered a robber while exploring a cave. There is a strong possibility that the cave in this episode is man-made.

225. The secret of a prosperous business

The criminal in this episode completely imitated the crime in "The Red-Haired Club". After breaking up the store, he dug out the jewelry he had buried under the house.

394． Adventure in the Weird House (Seal Chapter)

395． Adventure in the Weird House (Mechanism Chapter)

396. Adventure in the Weird House (Resolution)

With the house full of traps, the legendary treasure and Kidd involved in it, what will be the ending of the story?

446． Sealed Window (Part 1)

447. The Sealed Window (Part 2)

The legendary haunted villa, the sealed window and the mysterious secret passage, the environment where the case occurred is very similar to "The Blue Castle Exploration Incident".

571. The treasure-hunting battle in the monster warehouse (Part 1)

572. The treasure-hunting battle in the monster warehouse (Part 2)

Mysterious warehouse, where treasures disappear and appear?

M The Magician at the End of the Third Century

The authenticity in this theatrical version is also worth looking forward to!

Hope it can help you