Splatoon 3 launched for Switch on September 9 worldwide.

Here is an overview of the game, via Nintendo:

In the Splatoon series of action-shooting games, players play as Inklings—squid characters that can also take on a humanoid form. Nintendo launched the Splatoon game for the Wii U system in May 2015, and the Splatoon 2 game for Nintendo Switch in July 2017.

Splatoon 3 is the latest game in the Splatoon series, in which players face off against each other in two teams of four players, claiming territory by covering it in ink in Turf War battles. Building on the series’ foundation, Splatoon 3 adds new weapons, special weapons, and action to the game. In Splatsville, a chaotic city crowded with various elements, players can enjoy a large variety of battles: not only Turf War battles, but also the Story Mode in which players can battle and discover a mysterious place called Alterna on their own; and Salmon Run, where up to four players can work together and fend off powerful bosses. In addition, Nintendo will add more weapons and stages through updates for two years after launch, and hold events such as Splatfests, where players split into three teams to claim turf and overall victory. Players can connect with others around the globe online*, as well as play together locally, each with their own Nintendo Switch system.