Sega Net Mahjong MJ is a mahjong arcade game developed by Sega AM2 and released by Sega. The first version for arcades was released in July 2002 for the Sega NAOMI 2 arcade system. It featured online features with ranking, customization and recording your play history, using the experience that AM2 had developed from Virtua Fighter 4 and VF.NET. It received numerous updates and sequels since then.