come up with an idea for a 3D sigleplayer horror game.

Title: The Forgotten Manor

Story:
You play as Sarah, a paranormal investigator who receives a mysterious letter from an old friend inviting her to investigate a long-abandoned manor on the outskirts of town. As Sarah arrives at the manor, she quickly realizes that there is something sinister lurking within the walls of the decaying estate.

Gameplay:
The player must navigate through the dark and eerie halls of the manor, solving puzzles and avoiding terrifying entities that seek to harm them. As Sarah uncovers the dark history of the manor, she must confront her own fears and uncover the truth behind the haunting presence that haunts the manor.

Features:
- Immersive 3D environments that bring the manor to life
- Challenging puzzles that require wit and strategy to solve
- Atmospheric sound design that creates a sense of dread and unease
- A compelling story that unfolds as the player explores the manor
- Multiple endings based on the player's choices and actions throughout the game

Overall, The Forgotten Manor offers a thrilling and immersive horror experience that will leave players on the edge of their seats as they unravel the mysteries of the haunted estate.