Category:Elements by year

This is a catalogue of elements introduced by year. The year an element is introduced is the year its official debut episode is first released. For example, if the debut episode of an element is released in December 2016 on web and January 2017 on mobile then the element belongs in the "Elements released in 2016" category. If an element is first introduced in an episode released in 2015 but then a level from an episode released in 2014 is redesigned to have that element, then the element still belongs in the "Elements released in 2015" category.