Thread:WitherWolf/@comment-30700719-20170510112233/@comment-30700719-20170819010805

Okay, so in Portal and Portal 2, you are in Aperture Science. Got that? Now, we dive deep into the canon.

In Half-Life 2: Episode 2, Dr Kleiner mentions "our associates at Aperture Science". This means that Aperture Science (and everything related to it) exists in the same universe as a Black Mesa (and everything related to it).

That game that you heard about, about the promised cake? That was Portal and Portal 2. The cake was used as incentive to make the player go through a series of cognitive and physical tests.

So, yeah. The universe that has Gravity Guns also has Portal Guns.