Adult life sim · 18+ · In development

UnderlivesLife has no rules

A city that lives without you. Every person in it has a personality, wants things, and acts on it.

Events happen whether you are there or not: debts, betrayals, revenge, crimes. You are one life among thousands, under the same rules as everyone else.

Download the game Join the Discord

Free · Windows · Mods included

Other ways to install

Manual installZip of the whole game, about 23 GB, no updates. For macOS (Wine) or if the launcher won't start: unzip it and run Underlives.exe.

Already installed from the zip? Update onlyThe game alone, about 2 GB: unzip it over your Underlives folder. Your packs and mods stay as they are.

Live: the real Central London the game is built on, fifty people, no script

01Autonomous simulation

The city doesn't wait for you

NPCs use the same mods, actions and scenes you do. They borrow, work, seduce, steal and settle scores with each other. Nobody scripts it, and nobody stops it.

Happening right now, two streets awaycase_0412

Monday
Marc loses his job. Short on rent, he borrows 4,000 from Viktor, a loan shark who runs a bar downtown.
Two weeks later
Marc can't pay. Viktor is cruel and patient. He sends two men to remind him.
Next week
Marc is a coward: he hides and stops answering. Viktor doesn't let it go.
One night
Viktor's men take Marc's wife. What happens to her, abduction, sexual assault, is the price of the debt.
After
Her brother is vengeful. He goes looking for Viktor. The story keeps going, with or without you.

You were never involved. You might hear about it, or step into it. Life has no rules.

Kind
Cruel
Psychopath
Coward
Greedy
Jealous
Loyal
Vengeful

NPCs play the mods

Every action a mod adds is available to everyone in the city, not just to you. A new mod changes how the whole population lives.

Real personalities

Kind, cruel, psychopathic, fearful: each person weighs the same situation differently, so the same debt ends a hundred different ways.

Consequences that last

People remember. Unpaid debts, humiliations and favours ripple through families, friends and rivals for weeks.

You are one of them

Same rules for you: borrow, betray, protect, or become the one others fear. Or just watch the city tear itself apart.

Watch it happen in the city at the top of this page

In the game today

215Mods

1,590Actions

3,603Scenes

107Venues

962Clothing items

165Quests

02The world

Systems, not scripted rails

Everything is a system you can inspect, extend or replace. Nothing is hardcoded just to look good in a trailer.

Character creator

Sculpt faces and bodies with a full morph pipeline, then dress, name and place them in the world. Every slider is real data a mod can reach.

In game · no animation

Taking a handNobody animated this. His arm works out where her hand is and takes it, whatever their build.

Visual-novel scenes

Dialogue, choices and portraits presented through a proper VN layer — written as plain scripts anyone can open and rewrite.

Real cities

Streets, blocks and buildings generated from real-world map data — so the city you wander through is an actual place, not a backlot.

Living relationships

Family trees, dating, marriage, pregnancy and contacts — a real graph underneath, with people who keep living while you look away.

Work & economy

Take a job or run the place: businesses, employees, salaries, rent and reputation, all driven by the same numbers you can read.

Procedural interiors

Homes and venues assemble themselves room by room from authored grammars. Open a door and the layout beyond it is genuinely new.

03Modding

The mod layer is the game

The scripting API is not an afterthought bolted on after launch — it is the same surface the base game is built on.

Lua, not a custom dialect
Scenes, actions and stats are real Lua files. Bring a text editor and you are already modding.
Drop in your own 3D assets
Clothes, hair, rooms and animations load at runtime from .glb or .fbx — export straight out of DAZ or Blender, no engine cook required.
Content is just files
Every action, stat and scene the base game ships is a plain file next to yours, overridable by load order.

Read the modding guide

closing_time.luaEditable · real Lua

-- mods/night_shift/Scenes/closing_time.lua
-- WHERE: the venues this can happen in. WHEN: the hours.
return {
  WHAT = { "social" }, WHERE = { "diner", "bar" }, WHEN = { 21, 4 },

  RUN = function(Game, Player)
    Game:SceneStart()

    if Actor:isDating() then
      Game:Narrate(Player:name() .. " locks up with " .. Actor:name() .. ". Nobody else is left.")
      Player:ModifyStat("mood", 8)
    elseif Actor:hasTrait("greedy") then
      Game:Narrate(Actor:name() .. " counts the till twice. " .. Player:name() .. " pretends not to notice.")
    else
      Game:Narrate("Last customer gone. " .. Player:name() .. " and " .. Actor:name() .. " split a cold chip.")
      Player:ModifyStat("mood", 3)
    end

    Game:SceneEnd()
  end,
}

-- mods/night_shift/Scenes/closing_time.lua
-- WHERE: the venues this can happen in. WHEN: the hours.
return {
  WHAT = { "social" }, WHERE = { "diner", "bar" }, WHEN = { 21, 4 },

  RUN = function(Game, Player)
    Game:SceneStart()

    if Actor:isDating() then
      Game:Narrate(Player:name() .. " locks up with " .. Actor:name() .. ". Nobody else is left.")
      Player:ModifyStat("mood", 8)
    elseif Actor:hasTrait("greedy") then
      Game:Narrate(Actor:name() .. " counts the till twice. " .. Player:name() .. " pretends not to notice.")
    else
      Game:Narrate("Last customer gone. " .. Player:name() .. " and " .. Actor:name() .. " split a cold chip.")
      Player:ModifyStat("mood", 3)
    end

    Game:SceneEnd()
  end,
}

Edit it, run it: every person in the city above can then play it

04Gallery