I don't know if I can really give a fair review, as I've only ever tried 1 other MUD, besides Tsu. If you read other reviews on Tsunami, you may have seen one by Fragbait, that said his friends copied his behaviour - I am one of those friends. Since 1997 I've been hooked, and saw no reason to look elsewhere. The one time I was coaxed away, was because of a router problem preventing me from getting to Tsu. :). As soon as the problem was fixed, I headed back to Tsu, and my new other-MUD char was soon forgotton about. Tsunami has an ancient player base, as well as regularly new players. Something keeps bringing these players back (myself included), but I honestly can't put my finger on it! What is it that makes Tsunami unique? Well, it could be the variety that MUDs provide, but you wouldn't be reading this if you weren't already convinced that text based games have a place away from, and yet beside, graphical games. So my conclusion must be that it is unique, compared to other MUDs, something I can't rightly comment on. What keeps me coming back even if I don't really know how unique Tsu is? I honestly don't know. I don't know why I didn't get into that other MUD, and why Tsu pulls me back day in and day out. Its fun? That could be it.