Indie dev Arthur 'Mr. Pondukian' Lee was so wrapped up in mashing together Portal and Snapshot for this physics- and time-warping tech demo that he forgot to even give it a name! Silly boy. That's breaking one of the golden rules of self-promotion. In every other respect, Lee is very clearly not silly: this is a flat-out astonishing proof of concept. What if... instead of simply opening a doorway to another area, entering a portal you created also rewound time to the point where you created its exit, which was itself done by taking a screenshot of your desired destination point/time? Ack, my clumsy words plum don't sum this up at all satisfactorily. I'm going to have to ask you to watch this video. It's worth it, trust me.
That's a real, working tech demo, made in Unity 3D, by the way, doubters.
Proper clever, proper bonkers stuff. And, as every other bugger on the internet has already observed: get this in Portal 3, Mister Valve.
If I had access to that technology, I would use it to portal to my kitchen, at a time when I still had milk in the house, thus saving me from a beyond-agonising, uncaffeinated trip to the shop.
Coming next: a game about portals in which puzzles revolve around creating a world in which Portal never existed, and thus cannot be referenced in any discussion of games containing space-time manipulation.