Christmas Seaman: Omoi o Tsutaeru Mou Hitotsu no Houhou cover art

Christmas Seaman: Omoi o Tsutaeru Mou Hitotsu no Houhou

A limited-edition demo version of Seaman titled Christmas Seaman was released in Japan on December 16, 1999, and available for only ten days either through the Sega Direct online store or as part of an…

16 December 1999

Christmas Seaman: Omoi o Tsutaeru Mou Hitotsu no Houhou is a video game, released 16 December 1999 on Dreamcast.

Verified Sources: IGDB

What Christmas Seaman: Omoi o Tsutaeru Mou Hitotsu no Houhou is

Christmas Seaman: Omoi o Tsutaeru Mou Hitotsu no Houhou was released in 1999. It is available on Dreamcast only.

The premise, in the publisher's words

A limited-edition demo version of Seaman titled Christmas Seaman was released in Japan on December 16, 1999, and available for only ten days either through the Sega Direct online store or as part of an exclusive red Dreamcast pack-in. The title allowed players to connect to the online servers and exchange Christmas wishes and messages, while a Santa themed Seaman shares some of his trademark "Seaman wisdom".
Description from the publisher · source

What it launched against

Christmas Seaman: Omoi o Tsutaeru Mou Hitotsu no Houhou launched on 16 December 1999, within three weeks of Quake III Arena, Shenmue, Planescape: Torment and Garou: Mark of the Wolves.

Released around the same time: Quake III Arena, Shenmue, Planescape: Torment, Garou: Mark of the Wolves.

Parents

Quick answers

Christmas Seaman: Omoi o Tsutaeru Mou Hitotsu no Houhou — frequently asked questions

When did Christmas Seaman: Omoi o Tsutaeru Mou Hitotsu no Houhou come out?
Christmas Seaman: Omoi o Tsutaeru Mou Hitotsu no Houhou was released on 16 December 1999 for Dreamcast.