Code of Joker

» see coj.sega.jp as it lived, on the wayback machine

~ the last words ~

Code of Joker was a digital collectible card game that lived inside an arcade cabinet, which is a sentence that needs unpacking outside Japan. The rig came in two parts. A terminal unit sold you cards and a satellite unit played the matches, and a venue bought several satellites against one terminal. It ran on Sega's RINGEDGE2 board and it opened on 11 July 2013.

Your collection was not in your pocket. It was keyed to an Aime card on Sega's ALL.Net service, which meant the cards were a row in a database that belonged to Sega and the cabinet was a window onto it. More than nine hundred card types shipped over the run. That arrangement is why the ending left players holding nothing, and it was settled six years before anybody had reason to think about it.

There was a real competitive scene. In 2015 Sega ran Master of Agent, the series' first individual-bracket cash tournament, with qualifiers in Tokyo and Osaka and a final at Big Sight paying two million yen to the winner. A recurring national series called the Arcana Cup ran alongside it. The game was revised constantly, through eight titled major versions and thirteen smaller point releases, which is twenty-one revisions on top of the launch build.

Then it stopped. The final update, Ver.2.3EX2, landed on 7 June 2018, and the game ran thirteen more months without a single new card. For a product whose entire economy depended on new cards arriving, that is a long time to ship nothing.

Sega announced the closure on 10 April 2019, ninety-two days ahead. The notice thanked the agents and the venues, then gave the date. No cause appears anywhere in it. The companion data site, AgentLabo, stayed up until 15:00 on 31 July so people could look at their records for another three weeks.

~ the record ~

~ what became of the cabinets ~

There was never an offline mode and there could not have been one. With the server dark a satellite unit has no cards to show and no opponent to find, because both of those things were always somewhere else. Sega's answer for the hardware was a conversion kit that turned a Code of Joker cabinet into a Sega NET Mahjong machine, so the good outcome for a given unit was becoming a different game. The ones nobody converted kept their repair entitlement until 26 February 2021, when they aged off a generic seven-year parts schedule in a support notice that listed them next to an Anpanman popcorn machine.

I have never touched one of these cabinets and never will, since the last one stopped being Code of Joker before I knew the game existed. That is the ordinary condition for arcade titles that stayed inside Japan: the product cannot be examined later, because the product was a room full of furniture that has since been carried out.

~ two afterlives, both short ~

The phone version died first. Code of Joker Pocket, built by the same Sega division, ran from 5 January 2017 to 17 April 2018 and went dark nearly fifteen months ahead of the cabinets it was meant to extend. Its pre-registration had passed four hundred and forty thousand people. Sega had marketed the app under a one-service-many-devices banner, and it became the first thing under that banner to close.

The name came back in March 2025, when a Shibuya company called Jokers announced a licensed revival as a blockchain card game on the Sui chain, promising an overseas launch that summer. It sold an NFT pack in a Gatchaman crossover. On 22 December 2025 the developers cancelled the project, citing changes in the environment around Web3 games, and the revival never shipped a playable build. What exists today at that company's address is a buyback page refunding the card pack until 23 March 2026. Meanwhile coj.sega.jp is still standing, still Sega's, frozen on the final version's artwork with a red-bordered banner saying the service ended on 11 July 2019.

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