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For questions about the video game "Portal 2", a first-person puzzle video game created by Valve Corporation. It is the sequel to Portal (2007). Use in conjunction with the [portal] tag. Questons about gameplay mechanics are off topic and should be asked on Arqade (https://gaming.stackexchange.com/).
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What are the requirements for a portal from a portal gun (in Portal/Portal 2) to form?
Moon rock can't have been required, because Aperture built the first Aperture Science Portable Quantum Tunneling Devices in the 1950s, before moon rock was available.
I think this image is not canoni …