Turtle Noir (https://puzzle.yuisama.top) is a free online platform for Turtle Soup — the lateral thinking puzzle genre also known as situation puzzles or yes/no riddles. Each puzzle opens with a strange "surface" story; players uncover the hidden truth by asking questions that an AI host answers with yes, no, or irrelevant.
Key facts: the AI host knows each puzzle's full solution and answers consistently around the clock; the library contains hundreds of English mystery cases across easy, medium, and hard difficulty; you can play solo or invite up to 10 friends into a shared room; it runs in any browser with no download, and starting is free.