Meganet

Meganet, also known as the Net Work System, was an online service for the Mega Drive in Japan. Utilizing dial-up Internet access, Meganet was Sega's first online multiplayer gaming service, and functioned on a pay to play basis. The system functioned through the use of a peripheral called the Mega Modem and offered several unique titles that could be downloaded, and a few could be played competitively with friends. In addition, it shared technology and equipment with more serious services such as the Mega Anser, used for banking purposes. Though the system was announced for North America under the rebranded name "Tele-Genesis", it was never released for that region.

The Meganet service utilized its own library of titles, independent of the Genesis library. Most of these games never received a cartridge release; however, Columns, Flicky, Fatal Labyrinth, and Teddy Boy Blues each later saw cartridge versions. Several Meganet games would also later appear in Game no Kanzume vol. 2, released for the Mega-CD exclusively in Japan. Most games for the service were small, at around 128kB per game, due to the limits of Internet connection speeds at the time. Downloads were estimated to take about five to eight minutes to complete. All of the Meganet games were available through the Sega Game Library, accessed through the Meganet modem. Due to issues with long-distance charges through the use of telephone lines, as well as seconds of lag time between commands, only two games featured competitive play: Tel-Tel Stadium and Tel-Tel Mahjong, with the remainder of the games available for single players via download. Due to Sega's reluctance to commit to releasing the service in North America, third-party developers in that region were unwilling to invest in developing games specifically for Meganet. This resulted in a low number of titles created for the service.

Games
The following list contains all of the titles released for the Meganet service. All titles in this list were released in Japan only.
 * Sega
 * Sunsoft