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Undefined Fantastic Object is a 2D vertical scrolling danmaku/bullet hell shoot'em up game. The game is the twelfth official title in Tōhō series. The player chooses one of three characters - Reimu Hakurei (shrine maiden in Hakurei shrine), Marisa Kirisame (human magician, Reimu's friend) and Sanae Kochiya (shrine maiden in Morya shrine and newbie god). The story in the game is inspired by Buddhism (instead of Shinto) - several youkai want to free Byakuren Hijiri.

Gameplay is very similar to other Tōhō games - characters fly forward, shoot enemies, avoid many bullets and fight against bosses. The bombs system is similar to previous games, like in Tōhō 6 to 8. The player can catch coloured UFOs to gain special bonuses.


Undefined Fantastic Object Windows Big UFO bonus
Undefined Fantastic Object Windows Marisa
Undefined Fantastic Object Windows Crystals
Undefined Fantastic Object Windows Marisa's spell

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In April of 2017, a ransomware program called Rensenware was released. The only way for affected users to recover their files is to reach a minimum score of 200 million in this game's Lunatic mode. The malware program is able to detect when the game's process is running and reads its memory to determine whether or not the criteria have been met. The developer, an anonymous student from South Korea, created Rensenware as a joke and didn't expect it to spread very far. After he and many others became infected, he released a tool to undo the damage his program caused.

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666gonzo666 (61591) added Undefined Fantastic Object (Windows) on Apr 04, 2015