Dreamcast Live, which is a site dedicated to the online gaming aspects of the Dreamcast and a trailblazer when it comes to restoring online and multiplayer features to a host of games, Worms World Party players can now duel with other Dreamcast gamers over the internet.
I've got to be honest - I never really got too far into either Worms Armageddon or Worms World Party on the Dreamcast, but Team 17's series has a very long and storied history and is an important franchise in the grand scheme of multiplayer gaming on both console and PC.
Dreamcast Live right now. You might also want to check out Pcwzrd's guides to getting back online with your Dreamcast as they are numerous and vary in the amount of effort required, but at this rate the entire back catalogue might end up back online by the end of the year. Probably. Well OK that's an exaggeration, but you know what I mean.