Recently on here someone recommended a game called travle, which is a lot of fun even though I suck at it, as do my friends who play. Can anyone recommend other similar "one puzzle per day" style games?

I have fond memories of trying to solve HTML/text-based riddles on sites like WeffRiddles when I was growing up in the mid-late 2000s. The premise of the site is usually pretty simple: the landing page represents "level 1", and you had to find the correct URL to get to level 2, 3, and so on. The "puzzle/riddle" aspect usually involves inspecting the underlying HTML and looking through clues given in the source code, then using those clues to piece together the URL for the next stage.

It was always fun hanging out on forums and sharing clues about how to solve the level that everyone was stuck on. Also, being a kid back then, frankly I felt like a Hackerman™️ whenever I'd have to inspect the page source, paste it into Windows Notepad, then set font size to 1pt because I thought there was an ASCII art pattern hidden in the HTML. Good times.

Sometimes I get the urge to play these things again, but besides WeffRiddles which I know by name, I don't really know what this type of game is called. The closest "modern" example I can think of is /dev/esc, which is more like an online escape room than a long-form riddle site.

Does this ring a bell for you? Any other fun ones that you remember playing? And what the hell do I type into Google to find more of these?