The video above is a tech demo from Arthur "Mr. Podunkian" Lee, which combines a game that needs no description and a finalist in the IGF's Excellence in Design category in 2009.

At this point, it has no name and may not even be a game, at least not yet. Furthermore, even after repeated viewings, it's difficult to truly wrap one's mind behind what's happening.

For those who could use an explanation, someone over at Reddit, which is where I first spotted the clip, has a pretty decent one:

"It creates an alternate universe of the players current universe at the time of the screenshot and connects both with a portal. So, in addition to the usual portal antics you can also travel back in time into the alternate universe."

I also like this statement:

"I can already tell that a game like this is going to be too difficult for me."