(Image credit: Nintendo) Splatoon has undoubtedly been Nintendo's most successful of its new IPs, reinventing the team-based shooter that's often mature and militaristic for something more family-friendly and weird – and it's no wonder that the genre's popularity has only gotten broader with the likes of Overwatch and Fortnite targeting a teen audience with more diverse designs and colours. Yet while the ink-based shooter is best known for its Turf War battles, where teams compete to cover the map in their colour the most, or get splatted trying, real ones know that it's also produced some of Nintendo's most innovative single-player campaigns that pack the same charm and level design ingenuity of a 3D Mario title. It's nonetheless a surprise that, almost four years on from Splatoon 3's release, the next instalment won't be a numbered sequel but rather Splatoon Raiders, which, despite the plural in the title, is being marketed as a single-player-focused game.…