The mechanics in Neptral Tower are upgraded from its predecessor, Neptunia: Sisters vs Sisters. While retaining all of its key mechanics, it is expanded to three towers with the latter two being unlocked in the later chapters. As the party enters these dungeons, they will not be able to use any items in their inventory, such as unequipped weapons and consumables, and must use whatever they have equipped with the starting level specified in each tower. In addition, they will be unable to use the motorcycle to traverse through each floor if Older Neptune is in the party.
Clearing the 100th floor in a tower will allow the player to enter an unknown area where they can progress as high as they can.