Yūhodō

Yūhodō Co., Ltd. (有限会社　遊宝洞 Yūgen Gaisha Yūhodō) is a Japanese company that specialize in game system design, especially trading card games.

Yūhodō provided the game system and expansion design for Z/X -Zillions of enemy X- trading card game since its first released product up until its 14th expansion. Starting from Set 15 onward, Yūhodō announced that they are not involved in the development of the TCG anymore.