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Well, the title is "Notch programming a Doom-like in Dart." So, it doesn't sound like it's a port of Doom, just a game that's like Doom.

Was watching and the level he loaded was definitely a Doom one. Looked like the WAD was in his assets.

The WAD format was reverse engineered and published some time back in the 90s when the first third party level editors and mods were produced.

Indeed it was. Here's the unofficial spec in case anyone is interested. http://www.gamers.org/dhs/helpdocs/dmsp1666.html

It's not ALL in his head, he has the doom spec list to help him out when he needs it. But he's pretty skilled.

Typically a -like doesn't imply a port, but rather a game inspired by .