The Hogwarts Challenge

Ten challenges that start on the platform and end in the library. This isn't one of those "how well do you know Harry Potter?" quizzes with four questions and a percentage at the end: there are roller locks you have to turn until you land on the right figure, a castle broken into nine pieces to put back together, a panel of enchanted torches where every lever moves three at once, and a trace from the Marauder's Map that draws itself and wipes before you can copy it.

The questions that remain are the ones worth asking. The owl Harry is given when he finds out he's a wizard. The disarming spell that ends up being his signature. The anagram hiding the birth name of the wizard nobody names.

You play it from your phone, in the browser, with nothing to install and no account to create. You don't even have to leave the house: there are no GPS challenges. Around twenty minutes if you keep moving, longer if you get stuck on the castle, which most people do.

It's built with Envilo, which lets you put this kind of trail together around anything: a birthday, a proposal, a route through your own city, or a running joke between friends. If you like how it works, yours takes an afternoon and the challenges are these same ones.