Possessing people does not offer direct control over them, but provides control over their senses and mind-reading. Certain areas can only be reached by possessing a cat and sneaking inside. He has however access to a number of powers that allow him to influence people, eavesdrop on conversations, possess people directly and peek. Even though O'Connor can examine the environment, he is not able to interact with it directly. The player is allowed to make mistakes as it only leads to a lower ranking of the puzzle. After guessing successfully, the game moves on, usually to a new environment.

To advance, he then needs to answer questions about the scene in the form of a puzzle, built up through the clues. Each location has a number of clues to discover, but only the crucial ones need to be found. Starting with his own crime scene, O'Connor needs to collect different types of clues to move on to new locations and progress through the story. Despite the freedom of movement the investigation needs to be done in a linear way.

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