Kioh Gyoku (稀翁玉, lit. "Rare Old Man Ball") is a vertical-scrolling danmaku shoot 'em up, and is the second official game in the Seihou Project by "Shunsatsu sare do?" (at time part of Amusement Makers). It was released specifically for the Windows operating system around December time in 2001. It is a unique game where two players indirectly battle one another by charging and releasing charge attacks and bombs upon the other player, similar in the style of Phantasmagoria of Dim.Dream.
Kioh Gyoku is a vertical danmaku shooting game with massive emphasis on grazing streaming bullets, where two characters engage in danmaku gameplay within individual and separate play areas (aka. split-screen). Upon meeting certain conditions, players are able to unleash a variety of character-specific attacks upon their opponents in an attempt to whittle down their remaining health points.
In Story Mode, the player will face five opponents, each more capable than the previous. Kioh Gyoku also features a Match Play Mode where the player may face off against AI opponents or compete against other players, as well as watch AI vs. AI matches.
Name and Concept
The name 稀翁玉 is named after the Japanese-translated name of a cactus: "copiapoa krainziana".
There is no story included with the game, and thus only dialogue show is winning quotes.
The music of this game includes 10 tracks composed by ZUN. Each theme (apart from the title theme) is designed for one of the player characters specifically, due to the nature of the game. It's the first ever time ZUN used .wav recordings for the music. The game also included MIDI versions of the music that are meant to be played on a SC-88Pro, but according to ZUN, the MIDI versions aren't the same as the .wav versions, and he recommends listening to the later.
Later on, ZUN created an arrange of "Lovely Mound of Cherry Blossoms ~ Flower of Japan" (桜花之恋塚 ～ Flower of Japan) and "Enigmatic Doll ~ God Knows" (エニグマティクドール ～ God Knows) and added them to Dolls in Pseudo Paradise, where "Enigmatic Doll ~ God Knows" was renamed to just エニグマティクドール.