Deng team have been fixing Doomsday's multiplayer code since March and the point has been reached where most of the known showstopper problems have been fixed and actual game play testing can happen without major errors. The team have set up public test Deathmatch servers (co-op will follow later) for Doom, Doom II, Heretic: SOTR and HeXen, to help in finding out what is still broken. People interested in helping test should download the latest unstable build to join the game and expect to have to update regularly. The current unstable build can be accessed via the Doomsday Build Events RSS feed. More information can be found in the news thread at the Doomsday forums.