In between missions players can upgrade core systems, including weapons and shields. (gamecritics.com)
Nintendo has once again posted footage from Splatoon 2: Octo Expansion showing one of the different types of missions players will be able to take... (nintendonews.com)
Outside of the main storyline there are a variety of side missions players can choose to participate in, generally involving performing collection tasks for NPCs, as well as the option to purchase clothing and accessories to customise your character. (impulsegamer.com)