> Every year I get four days in before it feels like work. Same for me, but I don't think it's exactly about difficulty for me - I've done harder problems on P

> Every year I get four days in before it feels like work. Same for me, but I don't think it's exactly about difficulty for me - I've done harder problems on Project Euler, SPOJ, etc., and very much enjoyed them, but somehow Advent of Code doesn't click for me. I think the difference is that there's a lot more "chore" work in AoC problems, compared to Euler or SPOJ where it's mainly about an "Aha" moment figuring out a solution (possibly getting it wrong, going back on it, and getting a different "Aha" moment exercising a different area of your knowledge space).