noun
doujin game; fangame; hobbyist video game
Refers to video games created by hobbyists or small circles, often self-published at events like Comiket. Can be original works or derivative fangames.
彼は毎年コミケで新しい同人ゲームを発表している。
He releases a new doujin game every year at Comiket.
この同人ゲームは有名なアニメの二次創作です。
This doujin game is a derivative work based on a famous anime.