, also known as The Portopia Serial Murder Case, is an adventure game designed by Yuji Horii and published by Enix (now Square Enix). It was first released on the NEC PC-6001 in June 1983, and later ported to other personal computers. Chunsoft ported the game to the Family Computer (or Famicom), the Japanese version of the Nintendo Entertainment System (or NES), on November 29, 1985, and to different mobile phone services starting in 2001. It is the first part of the Yuuji Horii Mysteries trilogy, along with its successors and .