I had that once. I think it used to be much more secret than it is now, and was actually used to hire people for Google. Nowadays it's more of a fun easter egg. I didn't bother with any of it, because I couldn't be bothered with Python or Java.

Oh yeah. This is quite fun, though once you hit level 4/5 some problems require fairly advanced algorithms / mathematics. One of the problems I gave up on solving on my own required knowledge of Polyas enumeration theorem to solve. Fortunately or unfortunately you can find some answers online, otherwise I would’ve never even known such a theorem existed.

For the tougher problems, expect a lot of graph theory / combinatorics, which I guess is the nature of Googles challenges as a search engine.

I got this a few years ago. When I solved most of the questions, it asked for my contact info and Google reached out for an interview... which involved someone watching you code in a google doc, which distracted me so much I bombed

I went through these challenges a while back; they were super fun! I remember at the end there was something about "notify me if there are more challenges" but I don't believe I ever heard anything.

I'm a sucker for puzzles, and the write-ups for the challenges were the right level of silliness.

I don't do take-home assignments.

Yep, saw it one day before I had to have surgery, went into it and it gave me a couple day timer before it will vanish. So it timed out and I wasn't able to play around with it.