How to play Mothership
2–6 players · 180 min
Mothership is a sci-fi horror tabletop RPG designed by Sean McCoy and published by Tuesday Knight Games. The first edition Kickstarter (2022) became one of the most successful TTRPG crowdfunding campaigns ever run. Set in the far future aboard derelict ships, abandoned stations, and hostile alien worlds, Mothership draws heavily from films like Alien, Event Horizon, and The Thing — an atmosphere of creeping dread, corporate indifference, and the existential horror of deep space. Characters are working-class spacers (not special operatives or chosen heroes) doing dangerous jobs that pay barely enough to survive. The system is streamlined and deadly: rules are sparse, character death is frequent and intended, and the Warden (GM) is explicitly encouraged to run the game as a horror experience rather than a power fantasy.
How to play
Character creation: Characters choose one of four Classes — Teamster (generalist laborer with high saves), Marine (combat specialist with superior weapons and armor), Scientist (intellectual with access to specialized knowledge), and Android (artificial being with high logic but emotional disconnect). Stats are percentile-based: Strength, Speed, Intellect, Combat, and Instinct plus the derived Sanity, Fear, and Body saves. Skills are organized in a web — starting skills unlock adjacent skills as you advance. Core mechanic: Roll d100 under your stat to succeed. A roll equal to or under is a success; higher is a failure. Expert skill gives an advantage (roll twice, take lower); difficulty adds Disadvantage (roll twice, take higher). Critical Success (doubles under stat) and Critical Failure (doubles over stat or 00) create extreme results. Stress and Panic: Stress Points accumulate throughout a session from frightening events, failed checks, witnessing death, and other horror triggers. When a Panic Check is called (from a particularly disturbing event), roll d10 + current Stress against a Panic Table. High Stress results in increasingly severe panic reactions — freezing, fleeing, drawing weapons on crewmates, or catatonic breakdown. Stress recovers slowly during rest. Wounds and death: Characters have Hit Points and Wound Points. HP depletion triggers a Wound (a specific injury from the Wound table — broken limbs, internal bleeding, punctured suit, etc.). Wounds are serious, tracked mechanically, and require medical attention. A second Wound while already wounded often means death. Mothership does not pull punches. The Warden runs modules: Mothership is primarily a module-driven game — the Warden purchases or downloads scenario booklets ("pamphlet modules") describing a location, its inhabitants, its secrets, and its dangers. Official modules include the Dead Planet introductory adventure, Gradient Descent (a megacorp research facility), and Pound of Flesh (a space station den of scum and villainy).
Strategy
Mothership rewards cautious, paranoid play. Every system in the game pushes back against confidence and aggression. Stress management is survival: Stress is the game's most important resource. Players who recklessly walk into unknown areas, trigger unnecessary Panic Checks, and ignore stress accumulation die frequently. Strategies to manage stress: take shifts resting before entering dangerous areas, have the crew's Scientist identify threats before investigation, establish a safety word or retreat signal before every mission. The Android advantage: Android characters have no Panic or Sanity saves — they do not go insane and do not panic. In exchange they have a significant Instinct penalty and emotional limitations in the fiction. An Android crewmember who "anchors" the group during high-stress situations is invaluable — they can function when others cannot. Information gathering before action: Mothership modules reward players who investigate carefully. Most locations have environmental clues about what killed the previous crew, what the threat is, and how to avoid it. Rushing past these clues creates avoidable deaths. "We scan the room with our motion tracker" is a Mothership success strategy; "we open the door and walk in" is not. Flight is always valid: Unlike combat-focused RPGs, Mothership has no implicit obligation to confront a threat. Running, hiding, sealing bulkheads, and escaping in the ship are legitimate and frequently correct choices. The game is designed so that clever avoidance of the threat is as rewarding as defeating it. Combat is last resort: Marine characters are the most capable fighters, but even they are fragile. A well-armed NPC or creature can kill a character in a single round. Combat should be entered only when avoidance has failed and retreat is impossible — and even then, with a plan. Ambushes, environmental hazards, and improvised weaponry beat fair fights in Mothership.
Tips
- Never enter a new area without a plan to retreat; Mothership is a game about survival, not heroism. - Stress kills as surely as monsters — take rest actions seriously and protect crewmates who are near the Panic threshold. - Androids are invaluable anchors during high-stress scenarios; every crew benefits from at least one. - Investigate before you engage; almost every threat in a Mothership module has warning signs that cautious players can exploit. - Character death is frequent and intended — name your backup character before you sit down at the table. - Treat every airlock, bulkhead, and environmental system as a potential asset; Mothership modules are designed with the environment as a tool. - The Warden is not trying to kill you — but the situation you walked into might be; read the room (literally) before acting. - Wound complications (broken limbs, internal bleeding) accumulate; immediate medical attention after any wound is not optional.
Players and time
2–6 players (1 Warden + 1–5 players) in 2–4 hours per session. Pamphlet modules are designed to run in a single session. Campaign play is possible but less common than one-shot horror scenarios.
Starting modules
Dead Planet (free PDF on the Mothership website) is the official introductory adventure — a derelict ship mystery with escalating dread. Gradient Descent is the most ambitious official module for experienced groups. Most Mothership modules are short, cheap, and available on Itch.io.
The horror tone
Mothership is explicitly a horror game, not an action game. The Warden's job is to maintain dread and uncertainty, not to challenge characters with balanced encounters. If the group wants power fantasy sci-fi, Star Wars or Starfinder are better choices.
Common beginner mistake
Walking into Mothership with a D&D mindset — expecting that combat will resolve threats and that characters are resilient enough to absorb mistakes. A single Wound in Mothership is a session-long medical emergency.
Sources & attribution
- https://www.mothershiprpg.com/
Original how-to-play summary — not a substitute for the official rulebook.