Can you conquer every Super Mario game on the NES? Great.

Now do it all at the same time.

YouTube user agwawaf posted a video Monday showing him completing the first four Mario games using a single controller input. That's right: One controller, four emulators, four games running at the same time.

The trick is that this is a tool-assisted speed run. By using emulators, save states and running the games at a very slow pace, he was able to individually tweak and nudge each movement of the four Marios so that they would stay a hair's breadth from danger. It's still a remarkably impressive achievement when you consider the painstaking care that such a meticulous feat requires.

As with most tool-assisted gameplay videos, everything you see here is theoretically possible to do in real time, but so unbelievably difficult that the chances of a human being doing this are just about zero.

If you don't feel like watching the whole 13-minute clip, at least scrub to around the 10-minute mark, at which point agwawaf defeats three of the game's final bosses simultaneously.

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