Looks like you’ll be able to save your game in The Legend of Zelda: Majora’s Mask 3D any time you like due to the addition of Feather Statues. The original on the Nintendo 64 only had Owl Statues which only allowed for temporary saves. These would then be deleted when you selected it from the main menu. The method is still up in the air as it’s come from Amazon Germany description. Hopefully it will all be cleared by Nintendo in a forthcoming Nintendo Direct.

With the help of owl statues and the new feather statues, which can be found all over Termina, you can now save your adventure anytime you like

Thanks,Pablo