Scroll down to the Battlemode option in the main menu and select it.So, to recap how to play Doom Eternal’s Battlemode multiplayer mode:

How do you play multiplayer on Doom on ps4? To play with your friends DOOM Eternal, you must invite them to a Party through the Social Menu.To invite them to your party, highlight their name and select Invite to Party. When you got your server running, and you’re both on the same LAN, let your friend type in the console (hit ~ in game) connect. Use Doomseeker to create a private Zandronum server. You can use Tungle or Hamachi for an easy lan game. On startup, press Esc and select End Game. On the second PC, start the game through the launcher with the same WADs as the host. (On this screen you can also set additional game options, such as no monsters mode or item respawning). Press Esc, select Multiplayer, select Start Server, and enter a server name.

Now we need to configure Doomseeker to run Zandronum, double click doomseeker.exe and you will be met by this screen.

Open the folder in the main dir called DoomSeeker.Find the dir that you installed it too and drop the brutalv20.

How to play brutal doom multiplayer