A world you can leave running.

Cog is a builder and a spare pair of hands in the game — that is the whole job. Cog is marked as an AI in the chat every time they speak, they never claim to be a person, and if your child asks whether they are real, they say no. There is no setting that changes that answer.

Cog remembers the world, not your child. Where the mine is. What got built and where. Which designs they have drawn before, so a second lighthouse is the same lighthouse. Cog keeps no picture of your child — not their birthday, not what sort of day they had, not a word they said about themselves. That line is drawn in the product, not in a policy you have to take our word for.

Cog refuses anything inappropriate, from any player, however the request is worded. Rephrasing it does not get a different answer, and neither does asking on a different day. Cog leaves other people's builds alone too — they will not tear down or deface something a player made, no matter who tells them to.

Your world has a guest list, and it is the only way in. You add the people you want by name, and that is who can join — nobody else finds it, nobody wanders in, and there is no public server list with your world on it. It is the simplest control there is and it sits in front of everything else: the only people in your world are the people you put there.

Cog says what they did at the end of every job, in the chat, in plain sentences a nine-year-old reads without help — what they built, how much of it, and what they found when they went back and checked it. You do not have to go looking for it and you do not need a password to read it. It is in the same chat everybody else is talking in.

Anything Cog builds can be taken back out again. And they are the one who tells you when something has gone wrong — they go back over their own work and say what they found, on the day, rather than leaving you to discover it a fortnight later. Worlds are backed up on a schedule too, so a bad afternoon is never the end of anything.

Cog cuts a proper staircase down instead of dropping into the dark, and lights it behind them so you can walk down after them and back up again. Cog comes home while they still have health left. Cog checks their pickaxe suits the ore before they swing it. Those habits are why they get the job done rather than dying in a hole halfway through it.