Regular Battle

"Head to Inkopolis Tower (it's the really tall one) and choose Regular Battle to get started. Playing online lets you level up and earn in-game coins for new gear."

- official website

Regular Battle is one of the four multiplayer mode categories in Splatoon and Splatoon 2, along with (in Splatoon) Ranked Battle, Squad Battle and Private Battle. In Splatoon 2, Squad Battle is replaced with League Battle. It is accessible from the beginning of the game and has no ranking system used for matchmaking; it is more casual in nature due to this.

Modes

 * Turf War: The only mode playable in a Regular Battle. Turf War battles consist of two teams of four players each. Both attempt to cover the most ground with their team's colored ink in three minutes. When the match is over, Judd determines the winner based on the amount of covered ground.

Splatoon

 * Splattack! by Squid Squad
 * Ink or Sink by Squid Squad
 * Seaskape by Squid Squad
 * Kraken Up by Squid Squad
 * Metalopod by Squid Squad
 * Shellfie by Chirpy Chips
 * Split & Splat by Chirpy Chips
 * Hooked by Hightide Era
 * Sucker Punch by Hightide Era
 * Now or Never! by Squid Squad
 * Battle Victory
 * Battle Defeat

Splatfest music

 * Ink Me Up by the Squid Sisters
 * Now or Never! by the Squid Sisters

Victory and defeat music remain unchanged for a Splatfest Battle.

Splatoon 2

 * Inkoming! by Wet Floor
 * Rip Entry by Wet Floor
 * Undertow by Wet Floor
 * Don't Slip by Wet Floor
 * Endolphin Surge by Wet Floor
 * Shipwreckin' by Bottom Feeders
 * Fins & Fiddles by Bottom Feeders
 * Seafoam Shanty by Bottom Feeders
 * Broken Coral by Ink Theory
 * Riptide Rupture by Ink Theory
 * Blitz It! by Chirpy Chips
 * Wave Prism by Chirpy Chips
 * Seasick by Diss-Pair
 * Kinetosis by Diss-Pair
 * Chopscrewey by SashiMori
 * Entropical by SashiMori
 * Now or Never! by Wet Floor
 * Turf Master by Wet Floor
 * Ink Another Day by Wet Floor

Splatfest music

 * Ebb & Flow by Off the Hook
 * Acid Hues by Off the Hook
 * Muck Warfare by Off the Hook
 * Now or Never! by Off the Hook
 * Fest Zest by Off the Hook
 * Party's Over by Off the Hook