Radio Silence · A Hackyard Yard #6 entry

Modem
Warfare

Two phones in airplane mode. One naval war fought in dial-up chirps and QR codes. No internet, no server, no cheating.

Play now How it works

Free in your browser. Best with two phones and a friend in the same room.

Place your fleet, then salute with a QR code or a chirp.
Placement screen: a fleet of four ships being positioned on the 7 by 7 grid
How to play

Hide. Salute. Fire.

  1. Place your fleet. Four ships on a 7 by 7 grid, hidden from your opponent. The moment you confirm, your layout is sealed under a salted hash, before a single shot is fired.
  2. Salute, then trade salvos. A QR handshake pairs the two phones. Each round you fire three shots, and the phones exchange shots and results by sound or by QR. Nothing ever touches a network.
  3. The reveal audits everything. When the last ship sinks, both phones open their fleets and replay every round against the sealed hashes. The match is stamped VERIFIED, or LIAR with the finding named.

Straight from the game.

Every image here is a real capture of Modem Warfare running, nothing painted over.

Home screen: Modem Warfare, Radio Silence
The bridge
Placement: hiding the fleet on the grid
Hide your fleet
The salute: one phone shows its QR code, the other scans it
The salute
Battle: a salvo exchanged by chirp, the phones listening to each other
Salvo by chirp
Game over: the match stamped VERIFIED, no ship moved
The stamp

Directed by a human. Built by the workshop.

Modem Warfare was built for Hackyard Yard #6, “Offline”, by the Zouroboros Workshop from written briefs: seven build campaigns, 4 hours 47 minutes of build time, 66.6 million tokens, every stage test-gated before it shipped. The wartime soundtrack is an original score synthesised in code, and it ducks to silence whenever a chirp is on the air.

Read the source

Open source. Ships Friday Nov 6, 2026.