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The Puzzle Creator (also known as Puzzle Maker or Editor) is a part of the Perpetual Testing Initiative in Portal 2, a DLC released on May 8th, 2012 allowing the creation of both single-player and co-op test chambers within a simple in-game editor.
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The Aperture Science Handheld Portal Device (also known as the Portal Gun or ASHPD) is the experimental tool designed to place two portals that objects can pass through. This is the primary tool players are equipped with to complete Test Chambers.
Cave Johnson is the founder of Aperture Science, which was built from Aperture Science Innovations. He was briefly mentioned in Portal, but makes a more prominent appearance in Portal 2, in the form of tape recordings he leaves behind. His current status and whereabouts are unknown, presumed dead.