Portopia Renzoku Satsujin Jiken ("The Portopia Serial Murder Case"), is an adventure game that was created single-handedly by Yuji Horii and was initially published in Japan by Enix on cassette tapes for the NEC PC-6001 computer in June 1983. The title was later ported to several other Japanese computers but obtained mainstream success with the Famicom version developed by Chunsoft that was released on November 29, 1985. A remake of Portopia was again created by Chunsoft in 2001 that was released for Japanese mobile phones and featured completely redone artwork as well as a newly added save function. The game is the first of three adventure games created by Yuji Horii, which were retroactively called the Yuji Horii Mysteries trilogy, that also includes 1984's Hokkaidou Rensa Satsujin: Ohotsuku ni Kiyu!! and Karuizawa Yuukai Annai from 1985.
The game is an investigative adventure title in which the player must solve a murder mystery by searching for clues, exploring different areas, interacting with characters, and solving item-based puzzles all using the game's text parser or the verb window in the console release. The title allows for open-ended exploration where the player can solve the case in a multitude of ways and where their choices can effect the game's non-linear design. Environments are interactive, with the player being able to take out a magnifying glass to examine something or a hammer to hit an object. The game also lacks any kind of fail state and contains several alternate endings depending on who the player decides to accuse of murder.
The Portopia Serial Murder Case involves a mystery where a bank president named Kouzou Yamakawa has seemingly committed suicide inside a locked room within his mansion. An unnamed detective, the player, is sent to investigate the incident along with an assistant detective named Yasuhiko Mano, often called "Yasu" for short. The two must gather clues by visiting many real-world locations in Japan, including Kobe, Sumoto and Kyoto among others, and unravel the many mysteries surrounding the case.
The popularity of The Portopia Serial Murder Case, especially the Famicom version, inspired many other developers to create similar command-based adventure titles on the Famicom and other platforms, defining the adventure game genre in Japan and setting the ground work for the creation of future genres such as sound novels and visual novels. The Famicom port's cursor-based menu system also eventually paved the way for Yuji Horii's other seminal title: Dragon Quest, heavily informing how the menus would work in that title. Portopia was also the game that helped begin Yuji Horii's working relationship with Koichi Nakamura, who programmed the Famicom port of Portopia and would go on to direct the first five games in the Dragon Quest series.
Future game designers were inspired by Portopia as well. Portopia, along with the original Dragon Quest, was one the very first games that Eiji Aonuma ever played, who would go on to become the producer of the The Legend of Zelda franchise . Hideo Kojima has also stated that Portopia was one of the top five games that impacted his life the most and inspired him to enter the game industry . Hideo Kojima's early adventure games, titles such as Snatcher and Policenauts, take clear inspiration from Portopia. For example Snatcher taking place in Neo Kobe just like how Portopia takes place in Kobe City and the game even contains a video phone that can be used to call anyone at anytime very similar to the phone system in Portopia. Years later Kojima would go on to hid a ROM of the original PC-6001 version of Portopia in Metal Gear Solid V as an Easter egg .
- "Portopia" is a portmanteau that combines the words "port" and "utopia". The word does not originate from the Portopia video game but instead comes from "Portopia '81", also known as the "Kobe Port Island Expo", which was an exhibition held to celebrate the opening of Port Island in 1981 that lasted from March 20th to September 15th . The island is one of the largest man-made islands in the world and is located in Kobe, Japan, the city that the Portopia game mainly takes places in. Due to the name of the exhibition there are also many businesses on Port Island that contain the word "portopia" in their name including the Portopia Hotel and the Portopia Land amusement park who's ferris wheel can be seen in the distant at the Kobe Port in the Portopia video game. There is even a song performed by the band Godiego called "Portopia" that was created specifically to promote Portopia '81 and was used in the event's commercial.
- The phrase "犯人はヤス!" (“Han’nin wa Yasu!” or “Yasu is the culprit!”) is a common idiom in Japanese pop culture that is often used as joke answer when confronted with an seemingly unsolvable mystery and is referenced in all kinds of Japanese media. The saying is a well-known spoiler to the game Portopia, similar in some ways to how well known Aerith's death is in western pop culture. The phrase entered the mainstream thanks to a broadcast of the All Night Nippon! radio program held on January 23, 1986 where famous comedian and filmmaker Beat Takeshi played through Portopia live on the show and spoiled the game for many people in Japan .
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