Postmark

Wren Harbour, 1951. The town's new sorting machines arrived on Tuesday's lorry in eleven crates, and they have already frightened the cat. You are the new clerk, and the day's mail is pouring down the chutes.

Lay belts. Place Postcode Readers, Scales, Stampers, Return-to-Sender desks, Bundlers and Crossovers, and later Shuttles, Pneumatic Tubes and Clock Gates. Get every letter and parcel into the right sack, with no mistakes, and the day is sorted.

Then make it cheaper. Or faster. Or more compact.

A puzzle with many right answers

Every day can be solved several ways. When yours works, histograms show where it lands on cost, cycles and floor area, and the stamp goes in your album. Then the real game starts: can you shave a Reader off it, or get the mail out ten cycles sooner?

What's in the full game

• From Wren Harbour in 1951 into the Air Age: working days that are short and sharp, each built around one idea.
• Letters from home: optional puzzles from Kit's family.
• A town told through its mail. Letters arrive between days: the postmistress, the Gazette, the council, the harbourmaster. As the town grows, old rooms come back under new rules, and you can start from your old design.
• The Workshop: a sandbox for building whatever you like.
• Share your solutions as a short code, or save an animated GIF of the winning run.
• Commendations from Head Office to earn.
• Colour-blind patterns, reduced motion, and text that scales.

Free demo

Play the first eight days (and a letter from home) in your browser, right here on this page, or download the Windows demo. Progress from the Windows demo carries into the full game on the same computer.

System requirements

Windows 10 or 11, 64-bit. A mouse and keyboard. Mac and Linux builds are planned.

Windows may show a SmartScreen warning on first launch, because the game isn't code-signed yet. Choose "More info", then "Run anyway". Or install through the itch.io app, which avoids it.

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Made by Broomstar Games, a studio in Melbourne, Australia.