"Tears of the Kingdom: Zelda Devs Overcome Wii U Limitations and Bring Back Fan-Favorite Feature"

Zelda series producer Eiji Aonuma had hoped to include underground cave systems in Breath of the Wild, but the limitations of the Wii U prevented it. However, these caves will be available in the upcoming sequel, Tears of the Kingdom. The game's developers have stated that the focus is on encouraging exploration, and players will start seeing the world in a different light. The game will also feature sky islands and a return to "traditional Zelda".