Undefined Fantastic Object
Gameplay. "Undefined Fantastic Object" is a "danmaku" game in which the player has to navigate through a total of six stages, killing enemies, dodging their projectiles, and fighting a boss halfway through, and at the end of each stage. The player's main method of attack is their shot, but they also have access to a limited number of spell cards (also referred to as bombs), whose exact properties depend on the character and shot type, but all spell cards will clear the screen of bullets, grant the player temporary invulnerability, and deal a large amount of  damage. Unlike its predecessors "Mountain of Faith" and "Subterranean Animism", bombs are given their own counter, rather than being attached to the player's shot power. "Undefined Fantastic Object" is the only "Touhou" game in which the player does not lose points when they die or use a spell card. The game features three playable characters, Reimu, Marisa, and Sanae, each of whom have two shot types, one which deals high damage, whereas the other has homing projectiles. Some enemies in "Undefined Fantastic Object" have color-coded UFOs that circle around them, which will float around the stage when they  are killed. Some UFOs will flicker, and change their color after a few seconds, though this can be negated if the player is in close proximity to them. When the player collects three UFOs of a specific color, a large UFO will appear onscreen, which must be destroyed within ten seconds to grant the player a large point bonus, and extra items, depending on its color. Red UFOs will give the player extra lives, green ones will give them extra spell cards, and blue ones will give them extra points. If the UFO is not destroyed within the time limit , it will disappear, preventing the player from acquiring its items. Plot. In Gensokyo, rumors circulate about a flying ship, that appears to be searching for something, which the rumors claim belong to the Seven Lucky Gods, and is loaded with treasure. The player character meets Minamitsu Murasa, the captain of the ship, who explains that the UFOs they have been collecting are fragments of treasures that were once on the ship, which are being used to revive Byakuren Hijiri, a Buddhist monk who wants a place in which she, and other yōkai, can practice their powers freely. In the Extra  Stage, Marisa notices that the UFOs appear to be housing small snakes, which was the result of Nue Houjuu attaching the Seed of Unknown Form to them out of boredom. However, this goes against Byakuren's plans, and so after she is defeated, and the incident is resolved, Nue remains in hiding underground. Development. "Undefined Fantastic Object" was announced on ZUN's website on 26 February 2009, and the full game was released at Comiket on August 15. "Undefined Fantastic Object" was released on Steam on June 6, 2020, alongside "Mountain of Faith" and "Subterranean Animism". Reception. On Steam, 97 % of player reviews were positive.