ATS or Aperture Testing Spheres is a popular mod for the game Portal 2. In this mod, players take on the role of a test subject who must navigate through the testing spheres of Aperture Science Laboratories. The mod is set in an alternate timeline where the founder of Aperture, Cave Johnson, is still alive and overseeing the testing procedures. The ultimate goal of the mod is to successfully complete all of the testing spheres and receive the promised payment of $60.00. To do so, players must use their problem-solving skills and the various tools and mechanics available in the game to navigate through a series of increasingly challenging puzzles and obstacles.

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