A puzzle about the way out.

A coloured train stops with three seats. Tap the passengers whose colour matches and they board — but only if one straight line out is completely clear. No timer, no lives, no sign-up.

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Two levels in play: a coloured train at the platform and a grid of passengers below — Tap a passenger with a clear straight line out. Matching colour boards; the rest wait on the bench.

The idea

The colour is the easy part.

Matching colours takes a second; getting the passenger out takes the thought. A passenger can leave only along a straight line — up, down, left or right — that runs clear to the edge of the board. Corners do not count. So the board is read from the outside in: clear the edge to open the row behind it, and the one behind that.

Deliberately left out

—Timers and countdowns
—Lives, hearts and energy
—Accounts and sign-in
—Subscriptions and in-app purchases
—Scores, points and leaderboards
—Boosters sold for money

What's left

+One rule you learn in a single tap
+70 levels, six layouts each, drawn at random
+Every layout verified solvable before it ships
+A bench that fills up and ends the level
+Stars for how little you used the bench
+Korean, English, Japanese, Spanish — and offline

What's in it

Six things, done properly.

One rule, and it is strict

A straight, unbroken line to the edge of the board — up, down, left or right. Turning a corner is not a path. Everything in the game follows from that one sentence.

No board is ever unsolvable

Every layout is generated and then checked by a solver: it must be winnable, and it must be unwinnable without using the bench. Boards that fail either test are thrown away, not shipped.

A different board every run

Each of the 70 levels holds six verified layouts and picks one at random — including when you replay it. The level you failed is not the level you retry.

The bench is the pressure

Wrong-coloured passengers wait on a bench with very few slots. Fill it with no way out and the level is over. Later levels give you fewer slots, not more passengers.

Stars for restraint

The rating counts how many passengers you had to park on the bench — not points. Three stars means you barely used it.

No clock, nothing to lose

Think for a second or for a minute. Nothing counts down, nothing runs out, and nothing asks you to come back tomorrow.

The railway line of levels beside the title screen — Seventy stations along one line, and a title screen with nothing else on it.

Where it came from

One rule, rewritten until it was hard.

It began in July 2026 as a colour-matching prototype in Flutter and Flame: passengers on a grid, a lift that took three at a time.

The rule changed almost immediately. Reaching the exit used to be a maze search, which made the board impossible to read at a glance. Replacing it with a single straight line to the edge made every move visible — and the puzzle far harder to plan.

The lift became a train, the grid grew to seven colours, and the levels stopped being written by hand: a solver now builds and checks all 70 levels, six layouts apiece.

2026.07First prototype — colour matching on a grid

2026.07The straight-line rule replaced maze pathfinding

2026.0770 levels, six solver-verified layouts each

NowVersion 1.0.0 — Korean, English, Japanese, Spanish

Privacy

There is nothing here to collect.

No account, no cloud, no leaderboard to upload to. Your progress is a handful of numbers in the device's own storage, and it is deleted with the app. The game is free and carries ads, which means Google AdMob collects the usual advertising identifier and device information — all of it written out in the privacy policy.

Clear a path.

Free, and it works offline — the network is only used for ads. Coming to the App Store and Google Play.

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