Private Battle

Private Battle is a mode made available in the August Update on August 6th. Private Battle allows groups of 2-8 friends to play together in customized matches, where the host selects the mode and stage. Such battles will gain players no points and players' ranks will not be affected.

Private Battles can have any number of players from two to eight. The host can create even battles (such as 1v1 or 4v4) or uneven battles (such as 1v4 or 3v2). However, there can only be up to 4 players per team, and the host cannot assign everyone to the same team. The host can also set a password for the Private Battle lobby, so that only friends who know the password can join.

The host of a Private Battle chooses the stage and mode that will be used. There is also a random stage option. All stages and modes are available, and DLC stages/modes are added as soon as they are released. Like with Squad Battles, players can change their equipped weapon and gear in-between matches without having to leave the lobby and teammates' weapon selections are shown.

It is possible to create a private match using 8 Wii U consoles connected via a single router that is connected to the Internet.

Passwords
When necessary, you can add a password to your squad. This allows you to decide which friends you want to play with you, while keeping out other, less invited friends. The password is four digits long and must be entered by all friends trying to join the squad. The friends only rule still stands, so you can't just put a password out on the internet without becoming friends with the people you want to play with.

Trivia

 * During Splatfest, the only options in the Battle Lobby mode selection screen are Splatfest Battle and Private Battle.
 * Private Battles are not interrupted by Inkopolis News, unlike other battles. However, if a player disconnects from a Private Battle, the latest missed news announcement will appear.
 * If the host of a Private Battle is having a Splatfest, the Ink color set for each match will be the host's Splatfest color set.
 * The numbers on the password screen make sounds when hovered over, with a few duplicates. When done in a specific pattern, the final boss theme can be played.
 * If you scroll over certain keys in the password selection screen, you can play a simplified version of the squid sister boss song.