Acer1 did post an update via a post but he should have edited the main post saying that the Ninja Puzzle won't be removed permanently but " instead being rotated every determined cycle". This statement doesn't say anything about the other missions. https://forum-narutoen.oasgames.com/page/show-post-23303-5.html post #93. The rotation of the weekend missions is expected since China has it and they have more weekend missions than we do.