Exactly what it says on the tin. It could be a game, movie series, whatever, on any platform as long as it's relatively obscure. I'll start with:
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Good lesser known horror series?
The Kirlian Frequency - Good horror/mystery with an interesting art style (First half is on Netflix, the rest is on a crypto-based streaming service :o/ )
Cube Escape/Rusty Lake series - Fun surrealist horror/puzzle game series with an interesting story
anything else?