What Actually Happens

Your child has found a roleplaying game and you would like to know what is in it. This page is the honest answer, and at the bottom there is a novel made out of a real four-day run of it, so you can read the thing itself rather than a description of it.

What the game is

One young player and one Games Master. No board, no screen required, no winning. The player invents a person and then decides what that person does, and the other one describes what happens as a result, and dice settle anything genuinely uncertain. A session runs two or three hours. It is a conversation with rules.

The rules are Mythras Imperative, a published system, used unmodified — and free, as a PDF, from the people who wrote it. They amount to: roll two ten-sided dice, read them as a number out of a hundred, and try to get under the number written next to the relevant skill on your sheet. That is the whole of it. A child who can subtract can play this.

What it is about

Nine hundred and seventy-five years ago, people who knew perfectly well they would not live to see it work spent everything they had on robot ships, and threw them at the nearest stars. Where one arrived, a door opened. Those doors are the only way between stars, and the only thing that crosses one is a person.

And only the young can do it. By about twenty-two a body is finished. So the entire traffic of human space — every letter, every doctor wanted three doors away, every grandmother who wants to see her sister — rides on fifteen-year-olds.

Your child plays one of them. They are paid, they are respected, they are extremely good at a real job, and the adults around them are visibly glad they exist. That is deliberate. It is a game about being competent and being trusted with something that matters.

What it asks of a young player

Mostly: pay attention, ask questions, and decide.

The thing this campaign rewards is not quick reflexes or lucky dice. It is noticing. The whole first act turns on a child asking a man a direct question across a crowded room, and getting an answer nobody else had thought to ask for. Several of its best moments are a young person reading something that has been sitting in plain sight for years because nobody bothered.

It also asks them to take responsibility for a decision that costs somebody something, and to live with having made it. That is the part that tends to stay with people.

Danger, and what we promise instead of safety

People can be hurt in this game and characters can die, including your child’s. The rules are not softened and the dice are rolled where everybody can see them.

What the campaign guarantees in exchange is information. A character can only come to harm from a risk that was named, in the fiction, before the player chose it. No hidden trap. No ambush from a direction they had no way to check. And an honest answer, every single time, to the question can this kill me? — with no bluffing and no mystery.

In practice this makes the game safer than one that simply avoids danger, because it teaches a specific and genuinely useful habit: ask before you commit, and you will be told.

There is also a deliberate design choice about violence. Almost nobody in this setting reaches for a lethal weapon, and the reason is physical rather than moral: everyone lives inside a thin hull, and a weapon that reliably kills a person reliably opens a wall and kills everyone in the room. The professionals carry stunners, batons and restraint straps. Winning a fight means the other person is on the floor and tied.

What is not in it

No romance. No torture. No cruelty played for entertainment. No drugs, no gambling as glamour, no real-world politics in costume. Nobody is menaced for being who they are.

There is one adult theme and it is the heart of the thing: these children spend their own health doing this job, the spending is visible on their skin, it stops in their early twenties, and nobody in six hundred years has worked out what they are supposed to do with the rest of their lives. The campaign takes that seriously, treats it as a question worth answering, and offers three different adult answers to it.

The astronomy is real

Every star, distance, planet and oddity in this game is a current measurement, cited in the source. The map is Alpha Centauri and Barnard’s scorched pebbles, the brown dwarfs of Luhman 16 with weather and no sun at all, the twin flare stars of Gliese 65, the radio aurorae of YZ Ceti, and van Maanen’s Star visibly eating the wreckage of its own planets.

There is an automated test that fails the project if a number in the prose disagrees with the data file. Children notice when you make things up. This one does not.

If you are the one who has to run it

Quite likely, and worth saying plainly: you do not need to have played a roleplaying game before, and you have two routes.

Let the machine run it. The campaign ships as a plugin for Claude Code. Claude plays the Games Master, a rules engine does the dice, and you do not read anything. This is the shortest path from here to your child playing tonight, and it is a real game, not a demo.

Or run it yourself, which is better if you can. For that you need the rules, because the guides on this site are the story and the characters and deliberately not the system. They are Mythras Imperative, they are free, and The Design Mechanism publish the PDF on their downloads page.

And if you intend to run it yourself, play it through first with the machine running it. This is the single best piece of preparation available and it is not work. Sit down as a player, build somebody, and let Claude be the Games Master for three evenings — which is what Act One took the first time anybody played it.

You will come out the other side knowing the place from the inside rather than from a book: what the hall sounds like, how Calloway talks, which moments want slowing right down and which want one sentence. You will have had your own bad crossing and your own decision that cost somebody something, on your own time, rather than discovering both in front of your child. And the Games Master’s Guide will read completely differently afterwards, because you will have been there.

There is no spoiler problem in this direction. The adult at the table is supposed to know the ending; the player is not.

One caution, and it matters. Your child’s run will not be yours. They will ask people things you never thought to ask, walk past the thing you found, and solve the fourth day in some way nobody has seen yet. The value of having played is knowing how it feels from the inside — never a memory of the plot to steer them back towards.

Three things that make this less daunting than it looks.

You need about fifteen pages of it to start — how a roll works, how difficulty is set, and what a Luck Point does. One evening, unhurried.

You can skip the combat chapter, which is the intimidating one. There is no fighting anywhere in this campaign. Not one scene. The danger is a door that will not open and a clock that is running out, and nobody in this setting reaches for a weapon, because everyone lives inside a hull and a weapon that kills a person opens a wall.

You are not required to judge anything. You say how hard a thing is before the dice are rolled, and then you and your child find out together. That is a much smaller job than it sounds from the outside, and it is the part children find fair.

The Games Master’s Guide opens with all of this in more detail, including the part that is actually hard, which is not the rules.

Read the actual thing

The best answer to “what happens in it?” is to read what happened.

Go On Their Count is a short novel transcribed from a real four-day run of this campaign, played by a first-time roleplayer. The dialogue in it is the dialogue from the table. Nobody tidied it up afterwards, and nothing in it is hypothetical — a fifteen-year-old called Lint breaks an eighty-one-year-old woman’s wrist on page thirty because the player pushed when they had been told not to, and the rest of the book is the consequence of that.

It is the most accurate picture of this game that exists.

Go On Their Count (PDF) — about a hundred and fifty pages.

If you want to look further

The Players’ Guide is everything a player is allowed to know, and contains no spoilers. The Games Master’s Guide is the whole thing including the ending, and is the book the adult at the table reads.