Ad Technos was originally an advertisement company, made advertisements for Bandai (バンダイ).
Later on, Ad Technos anonymously undertook designing some wargames of Bandai if Series.
After that, Ad Technos independently began designing of wargame/boardgame since 1983.
Some games were released from Ad Technos, some games were supplied to Tsukuda Hobby / Original.
Wargame series released from Ad Technos were called 'Simulation Game Books (SGB)' series because the first six games were published in book format (on and after SGB-7 were box games).