No idea how to start playing MUD2? Check out the extremely unfinished page on my site with instructions for how to do just that!
to answer your question: it's an online multiplayer text-based virtual world (it's pretty much the OG one) from Ye Olde Days, before they had invented things like 'graphics' and 'microtransactions' (and it's completely free to play it nowadays). Also it has permadeath, which keeps things from getting overly stale. Unfortunately, not many people play it nowadays, but I'd say it still holds up rather well to this day
If you wanna hop in and have a preliminary bit of checking things out, there's a web-based client at https://mudii.glitch.me (but I'd suggest downloading an actual MUD client, like Mudlet, if you want to have a decent experience)
Thanks for letting me know, I've now replaced the placeholder button with your pretty darn cool button :)
either way, I've now updated it to have an 88:31 aspect ratio as it should have had in the first place 😅