Step into the Psychological Horror Puzzle Collection , a collaborative Steam bundle featuring six atmospheric indie titles built around fear, mystery, and mind-bending puzzles. This unique collection brings together: Sphenoid - claustrophobic escape-room horro
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Sphenoid is an adventure video game, released on 17 September 2025 on PC.
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Sphenoid is a horror escape room that takes place in a prison. You wake up to find that everybody has disappeared. As you explore the prison, you will find clues and puzzles that you will need to solve in order to escape.
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