Over at Puzzling.SE, we require all answers to contain explanations. For riddles, what usually happens is that the answerer will post an explanation within a spoiler block for each line of the riddle. This can result in several spoiler blocks within the answer (here is a typical example). Someone who wants to read the answer to a riddle may have to click several times to reveal all of the spoiler blocks.
I propose a new feature to allow a user to automatically reveal all spoiler blocks in a post at once. Perhaps there can be an "spoil" link at the bottom of a post next to the "share", "edit", and "flag" links. When a user clicks on "spoil", all spoiler blocks within that post will be revealed. Of course, a user could still click on an individual spoiler block to reveal just that block.