Unanswered Questions

I want to alert puzzle writers to a potential cognitive bias I'll call the many-eyes effect. Many people try to solve your puzzle, but only those who succeed post. It's tempting to imagine the posters ...

For those who don't know, the Director of Community Development at the Stack Exchange company, Mr Robert Cartaino, is no longer employed by Stack Exchange. Tributes are already flowing in on main meta ...

Puzzling.SE hasn't really seen much spam in the past, but we've had just a bit of it recently. Since it hasn't come up before, the question of what to do about it hasn't come up either. Using This ...

This is a list of unofficial, deadline-less (hence not searchable) bounties offered by users on various challenges on the main site. Disclaimer: There is no guarantee that the user will award the ...

On 29 March 2022, our own GentlePurpleRain received a Deputy badge which can only be awarded to non-moderators. Without speculating on why he stepped down (unless he wants to share his reasons), let's ...

What is MathJax? It lets you include nicely-typeset mathematics in PSE questions, answers, and comments. The syntax is described below (with links to places where you can find more details). Two-...

The USA Mathematical Talent Search, or USAMTS for short, is an annual mathematics competition for middle-school and high-school students in the USA. Its questions are posted on the internet and ...

On 30 May 2025, our Rubio received a Marshal badge which can only be awarded to non-moderators. Without speculating on why he's no longer a mod (unless he wants to share anything, and assuming it wasn'...

This question is part of the best-puzzle award series. What are your nominations for the best puzzles, here on Puzzling.SE, of the third quarter (July / August / September) 2018? Suggested ...

I've recently joined this community and discovered an interest in puzzles that I didn't know I had. The atmosphere and camaraderie are great. The only problem for me is detecting in-jokes. Example ...

Previous years: 2021, 2022, 2023, 2024 There will be a Christmas-themed puzzle every day between the 1st and 24th of December, where the accepted answer will be rewarded with a bounty. To make this ...

Update on March 20, 2025 These changes have now been made. There is a standing request for customization of punctuation in Question titles on Puzzling SE. Partial customization is possible with the ...

If you're an active PSE user, you'll know that bobble is an active moderator (merely without a diamond). Just recently she reached 1000 helpful flags... which is quite a feat given her time on PSE (&...

Every year, the users of Puzzling Stack Exchange can be ranked by their reputation earned in that year. Every year, someone (usually one of the established users) takes the top spot in the yearly ...

There has been a recent spate of related "22+4" questions that can all be answered by using different cyclic numbering systems. The OP's always say "use base 10," perhaps not realizing that that ...