Reversi: 80 Days Patent War

Reversi in 80 Days

A steampunk Reversi race around the world, where every board you win is a patent seized. The AI thinks on your device, so you finish every game offline.

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Inside the app

  • Home — where you are on the journey and the days left
  • Match — fight for a patent against an AI that thinks on your device
  • Player vs player — a real opponent close to your rating
  • Patent ledger — a certificate for every leg you cleared

Five chapters

  1. 1London and EuropeLegs 1–10
  2. 2Transcontinental ExpressLegs 11–20
  3. 3Desert RuinsLegs 21–30
  4. 4Cities of the Far EastLegs 31–40
  5. 5Sky FortressLegs 41–50

About this app

  • The AI thinks on your device

    Your board is never sent to a server to choose a move. Finish every game with no signal.

  • 1–3 days per game. Around the world in 80

    Win convincingly and you lose fewer days. Days are the measure of the journey.

  • Every leg you clear becomes a patent

    A gold seal for a crushing win, a provisional patent for a narrow one. Win big again to upgrade any time.

  • Player vs player, matched by rating

    Real opponents, 45 seconds a move. Win to raise your rating and climb the leaderboard.

  • Replay every move afterwards

    Rewind the record and read the AI review for free.

  • 10 languages, 4 text sizes

    日本語, English, 简体中文, 繁體中文, 한국어, ไทย, Français, Deutsch, Español, Bahasa Indonesia.

The whole journey

A chart of the fifty legs that circle the globe eastward from London, with the patent certificate and the rival who blocks the way.

Latest articles

Short reads on how to think about Reversi and how to get better.

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Frequently asked questions

Is it free?

You can start for free. Matches against the AI, the journey, player vs player and the AI review are free. Removing ads (a one-time purchase that also opens the scoring of how you play and the AI coach) and some cosmetic avatars are paid.

Does it work offline?

Matches against the AI and the journey work offline to the last move. Player vs player, the leaderboard and the AI review need a connection.

What are the “80 days”?

The journey’s time budget. Each game costs 1–3 days, and a convincing win costs fewer. The goal is to complete all 50 legs within 80 days.

How are opponents chosen in player vs player?

We look for players close to your rating, widen the range every second and stop after 60 seconds. Whether someone is found depends on who is searching at the same time.

Where is my data stored?

Match records, journey progress and settings stay on your device. Player-vs-player results and ratings are kept on the server. Everything can be deleted from inside the app.