Atomic Heart Testing Grounds and Polygons explained

What are those Atomic Heart Testing Grounds, anyway? It's quite possible to play through the entirety of Atomic Heart without stepping foot in one of the Testing Grounds - or Polygons - marked on the map, because they're an entirely optional side endeavour for Major P3 to tackle while trying to stop the robot uprising.

The main reason to tackle Atomic Heart Testing Grounds is to find new attachments and upgrades for the best Atomic Heart weapons. You'll know exactly what rewards you can earn before going in if you take a look at the Atomic Heart map, with each attachment listed in bronze, silver, and gold rarities - more on those in a moment. So if you're playing this open-world game and want to know what you can get from the Atomic Heart Testing Grounds, or Polygons as they're also referred to, here's the lowdown.

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