Play a Parasitic Brain Mushroom in Signet City

Signet City: Parasitic Brain Mushroom Fungalpunk RPG from Citizen Sleeper Creator

Signet City is a first-person, story-rich fungalpunk roleplaying game in which the player controls a parasitic brain mushroom known as a "symbiote" that can inhabit and switch between multiple human hosts within a city built entirely from living fungal matter. The game is developed by Jump Over the Age, the studio founded by Gareth Damian Martin, and is published by Fellow Traveller (known for Citizen Sleeper, Neocab, and Heaven's Vault). It solves the narrative problem of a single-protagonist perspective by allowing the player's parasitic consciousness to experience the world through different bodies, each with unique abilities, relationships, and personal storylines. The game was announced via a trailer and feature preview published by Rock Paper Shotgun. As of the source article, no specific release window or price has been confirmed.

Key Facts

How Does the Parasitic Brain Mushroom Mechanic Work?

The player controls a parasitic brain fungus—called a symbiote—that can detach from one human host and inhabit another, allowing the player to experience Signet City through multiple perspectives, each with distinct narrative threads and gameplay abilities. Gareth Damian Martin, writing on the game's design, explained the concept as a narrative tool: "The symbiote is a way to explore the idea of identity as something fluid rather than fixed. Each host has their own life, their own problems, and their own connections to the city." The mechanic is not merely a superpower; it is the central storytelling device. Each host character has a personal storyline that progresses independently, and the player's choices in one body can ripple into the experiences of another. The symbiote itself has its own abilities—such as sensing the fungal network that underlies the city—which remain constant regardless of which host it occupies. The source article did not provide exact statistics on the number of hosts or quests available.

What Is a Fungalpunk Setting?

Fungalpunk is a speculative fiction aesthetic and genre in which biology—specifically fungal life—replaces industrial and digital infrastructure, with cities grown from mycelium, technology based on spore communication, and societies built around symbiotic relationships with fungus. Signet City is described by the developer as a "fungalpunk" world. The city's architecture, transportation, communication systems, and even its economy are derived from fungal growth. Unlike steampunk (steam power) or cyberpunk (digital networks), fungalpunk centres on organic, networked growth. The setting draws on real scientific concepts: mycelial networks that share nutrients and information underground, parasitic fungi that alter host behaviour (such as Ophiocordyceps), and lichen-like symbiosis. In Signet City, the player's symbiote is a natural part of this ecosystem, not an anomaly. The game uses this setting to examine themes of interconnection, dependency, and the blurring of individual boundaries.

How Does Signet City Compare to Citizen Sleeper?

Signet City differs from Citizen Sleeper in perspective (first-person vs. text-based), world scale (a single city vs. a space station), and core mechanic (host-switching vs. dice-based survival), but shares the same narrative DNA of embodied identity, precarious existence, and player-driven storytelling. Both games are developed by Jump Over the Age and published by Fellow Traveller. Citizen Sleeper (2022) is a text-heavy RPG set on a space station where the player controls an escaped android whose body is deteriorating. The game uses a dice-placement system for actions and focuses on survival, relationships, and finding purpose. Signet City, by contrast, is fully first-person and real-time (not turn-based), with environmental exploration and direct character interaction. Both games, however, centre on a protagonist whose body is not fully their own: the Sleeper is a corporate-owned android, and the symbiote is a parasite renting bodies. Gareth Damian Martin stated in the source interview: "I'm interested in characters who are forced to negotiate their existence with others. The Sleeper has their body; the symbiote has other people's bodies. Same problem, different angle."

Who Is This For?

Signet City is designed for players who prefer narrative-driven single-player games with experimental mechanics, ethical ambiguity, and speculative worldbuilding over combat-focused or loot-driven RPGs. The ideal user is a fan of Citizen Sleeper, Disco Elysium, Kentucky Route Zero, or What Remains of Edith Finch—games in which story and character supersede mechanical progression. The host-switching mechanic specifically appeals to players interested in narrative structures that allow multiple viewpoints, unreliable perspectives, or ensemble storytelling. Because the game has no announced combat system, players seeking action or adversarial gameplay will not find it here. The fungalpunk aesthetic, meanwhile, is likely to attract audiences interested in biopunk, eco-horror, and speculative biology. No demographic data or sales projections were provided in the source material.

Common Questions

Do you lose progress when you switch between hosts in Signet City?

No. Each host's story and relationships persist independently, and the symbiote retains its own abilities across all hosts. The player can revisit any previously inhabited host to continue their personal storyline.

Is Signet City a horror game because of the parasitic brain mushroom concept?

The developer describes the game as more contemplative and narrative-focused than horror-oriented. While parasitic fungi can be unsettling, the tone is described as exploratory, focusing on symbiosis and identity rather than body horror or jump scares.

When will Signet City be released and on which platforms?

As of the source article, no release date or window has been announced. The game is confirmed for PC, with no console versions mentioned. Pricing is also unannounced. The article was published around the announcement trailer, so details remain sparse.

Sources and Methodology

This article is based exclusively on the Rock Paper Shotgun preview and interview titled "Play a Parasitic Brain Mushroom in Signet City, the First-Person Fungalpunk RPG from the Creator of Citizen Sleeper," published on the Rock Paper Shotgun website (rockpapershotgun.com). The source material provides feature description, developer quotes, setting details, and gameplay mechanics for the announced title Signet City by Jump Over the Age and Fellow Traveller. No secondary sources, press releases, or official store pages were consulted. No currency or unit conversions were required. This article was last updated on 2 June 2025.