Waterline

The city sleeps.
The water doesn’t.

A quiet water-equalization puzzle for the hours nobody’s watching. Seventy junctions, seven districts, no timer anywhere.

Currently in beta on TestFlight, by invite. The city will find out about the App Store when we do.

Join the beta

Rain falling over the sleeping city's rooftops at night.

01 the city

The city sleeps through the rain. Rooftops, streetlights, an endless gentle storm. Nobody up there is awake, and nothing up there is wrong.

The underworks: pipes and a lantern above a running channel of water.

02 the underworks

Beneath it, one floor down, the underworks keep the water where it belongs. Pipes over a running channel, doing the work the city never has to think about. This is the premise, not the plot.

A workbench with a lit lantern, gloves, a wrench and a coil of rope.

03 the bench

Tonight, that’s your job. A lantern, a pair of gloves, a wrench, a coil of rope, laid out on a workbench. Nobody’s standing at it. The tools are the only character this story needs.

First light over the city's canal, the storm cleared.

04 the point

The city will never know. That’s the point. Somewhere below the streets, walls get tapped, water finds its level, and by morning every line is met — quietly, and without applause.

Seven districts

The journey

Seventy junctions, walked in order, each district its own hour of the night.

01Levels 1–10

The Cisterns

Your first hours underground. You learn the silence down here, and what the water is telling you — and that some of it has to be let go through a drain, not held forever.

02Levels 11–20

The Canals

The canals climb into open air, and the grand basins that look equal are not. Past them, water spills over a rim on purpose — that’s how the canals have always spoken to each other.

03Levels 21–30

The Metro Tunnels

Nothing is wasted down here. Every drop you release through a broken wall arrives somewhere else entirely — the tunnels teach you to send it well.

04Levels 31–40

The Harbor Locks

At the sea’s edge you learn the tide-wright’s rule: some doors only open one way. That isn’t a flaw. That’s the lock.

05Levels 41–50

The Deep Mains

The oldest pipes under everything. Tonight the city trusts you alone with the works its builders left behind — no new tricks here, just the exam.

06Levels 51–60

The Clockworks

The old automation still runs, gates and sensors from a shift before yours. Set it right, and the room starts tending to itself while you watch.

07Levels 61–70

The Sealed Gardens

The last room. What the builders sealed here, they sealed on purpose — trapped air is a promise, not a fault. Past the last lid is First Light: the seventieth junction, the night’s only story event, and the city waking up none the wiser.

Three rules, no others

How it plays

Break walls.

Tap the wall between two tanks and it’s gone. That’s the only move there is.

Water finds its level.

No luck, no randomness — the water always settles to the same volume-weighted average, the same way, every time.

Meet the lines.

Every tank has a gold line to reach. Get there, in whatever order you find, in your own time.

No timers.
No ads.
No accounts.
Fully offline.
One purchase, the whole city — the first twenty junctions are free.
Gets harder every district — checked level by level, so the curve never goes soft.

Support

Write to the night shift

Something broke, something felt unfair, or you just want to say the third star on level 40 nearly finished you off — write to us.

cinkilic.ozgur92@gmail.com

Tell us your device and iOS version, and the level number if it’s about a level. That’s usually enough to find it.

We’re small, and we read every message ourselves. Replies aren’t instant — we keep the same hours as the rest of the underworks — but they come.

The city sleeps.The water doesn’t.