Hmm, well, being based in a browser is irrelevant to its MUD-dom or not (we have about 35% of our online players using our web-based client at any single time), but beyond that, it doesn't appear to be a MUD at all. One of the criteria that I believe makes a MUD is some representation of space (whether graphical, via cartesian coordinates, nodal network of rooms, etc) and real-time interaction within the context of that space.
--matt
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