I thought it would just move me to the next puzzle. I still wanted to finish it later. I suggest renaming it "show solution" and having it ask if you're sure.

You know, you're absolutely right. I just now renamed it to "Reveal solution" and added a confirmation.

 The original reason I had that button was for people affected by Safari not saving progress, to be able to quickly reveal articles they'd already solved but that weren't saved. So the extra confirmation click might not be appreciated there... but I'm also now hoping players in Safari will play on the standalone site rather than itch.io to avoid that bug, so that use case is less important. (I explain all that in case anyone else feels differently about these changes - feel free to give your point of view.)

But yeah, I definitely want to avoid spoiling puzzles for people accidentally, so thank you for the suggestion @DanielLC!