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."

- Splatoon's official website

Regular Battle is a multiplayer mode category which is not ranked and accessible from the beginning of the game (provides one has an Internet connection), unlike its Ranked Battle counterpart. It is more casual in nature as well.

Modes

 * Turf War: Currently the only mode classified under the unranked Regular Battle category.

Turf War
Turf War battles consist of two teams of 4. Both teams attempt to cover the most ground with their ink in three minutes. When the match is over, Judd will determine who wins.