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Aperture Tag: The Paint Gun Testing Initiative is a fan-mod of Portal 2, utilizing a scrapped testing element, the Paintgun. It draws inspiration from the game Tag: The Power of Paint, which in turn was the inspiration for the Gels in Portal 2.
Aperture Tag: The Paint Gun Testing Initiative/en is based on Portal 2's engine branch. Therefore, much of the documentation on this wiki pertaining to Portal 2 may also apply to Aperture Tag: The Paint Gun Testing Initiative/en.