Get the latest ZDoom build from this forum thread, the epicenter of Mac ZDoom development. [EDIT 20090923: The download link on the forum post is currently unavailable; check there for the most current version, but here's a mirror of the one I used to get this working.] Ignore the bleatings of “Get a real computer” from entrenched Winbags.
- Unzip the archive and put ZDoom in Applications or wherever. Start it once and note the plaintive wailing that you’re missing an IWAD:

Get an IWAD so ZDoom will run. I used the Freedoom Complete IWAD. Take the doom2.wad file from that archive and put it in [your home directory] > Library > Application Support > zdoom. You just need that file and it needs to be in that folder, not a folder inside that folder.

Get Urban Brawl from Mancubus. It comes in an archive with a bunch of other files that make it ready to run on a PC. The only file you need is action2.wad, you can scrap the rest. [But while you're there, you should grab Action Doom 1 too.]

Okay, now start ZDoom. Did it complain that it couldn’t find a Doom WAD? No? Great! You put it in the right spot. Now click on “Show WAD Options,” click “Add” in the tray that slides out, and navigate to whereever you put “action2.wad.” Your WAD options should look like this.

Click “Launch” to start busting heads. If you get a terminal window, you probably chose more than one WAD file. You gotta pick one at a time.

I don’t know how well this will work with other Doom source-ports like PrBoom, because the author clearly wrote it with ZDoom in mind, or else I’d try it with the Wii too. Also, there are some dark spots I’m not sure are supposed to be so dark, but I played up to where !SPOILER! Haggar joins you last night and it was very very playable. Nonetheless I would love refinements from the audience, if there is one. I might have just packaged it all up myself, but these components all come from completely different sources and asking permission is tough.

Feel free to ask questions here in comments, I will try to reply [in comments] as time and intelligence permits.

EDIT 20090924: Updated link to Freedoom IWAD — thanks Gary!

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I wondered, “How did they cram all the excitement of the arcade game into such a tiny package?” My question was more or less answered when I clicked through the tutorial and saw these ominous words: “PRESS 6 TO ATTACK”

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