It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

×
All the other build games had online coop and multiplayer
avatar
BananaJane: All the other build games had online coop and multiplayer
Because they've used eduke32 which had the old p2p muliplayer code removed a long time ago. The newer client/server based code has been WIP for at least five years.