Does anyone know whats the episode that Conan, Ran , Heiji and Heiji's girlfriend was trapped in a house. And the episode was somehow in a snow season. There was a murder case in the house and with few others. They teamed up with an uncle, the uncle c

I don't know if this is what your looking for, but...EP291-293 kinda fit your description. In the Episode: Conan, Heiji, Ran, and Kazuha are eventually trapped in a run-down house with some other people. Later, Ran and Kazuha's martial arts skills are brought up. However, there is no snow...they're on a deserted island in Okinawa. And there was a murder case. I hope this helps...