About Splatoon. Splatoon is a third person shooter released on May 29, 2015, by Nintendo. The game consists of multiple online multiplayer modes and a single-player campaign, where the player uses an arsenal of weapons to splatter ink around an arena.bout Splatoon. Splatoon is a third person shooter released on May 29, 2015, by Nintendo. The game consists of multiple online multiplayer modes and a single-player campaign, where the player uses an arsenal of weapons to splatter ink around an arena.