Game: Hokkaidou Rensa Satsujin:The Portopia Serial Murder Case

Portopia Renzoku Satsujin Jiken follows a first-person perspective and narrative. The various events are described with still pictures and text messages. The player interacts with the game using a verb-noun parser which requires typing precise commands with the keyboard. Finding the exact words to type is considered part of the riddles that must be solved. While sound effects are present, the game lacks music and a save function.[4] It features a branching dialogue conversation system where the story develops through entering commands and receiving answers to them from the player's sidekick or non-player characters.[2] The game allows multiple different ways to achieve objectives,[5] adding an element of nonlinear gameplay. This included travelling between different areas in a generally open world and making choices that determine the dialogues and order of events as well as alternative outcomes depending on who the player identifies as the culprit. However, only one of the characters is the true culprit, while the others are red herrings; if the player closes the case with the wrong culprit, then the player will face criticism from the police chief and need to re-open the case. The game includes a phone that could be used to manually dial any number, which is needed to contact several non-player characters.[2] The game also features an inventory system requiring the examination and collection of items, which could be used as evidence later in the game