On other Stack exchange sites users ask questions which they need help with in hope of getting answers. This site is unique in that questions/challenges that the OP knows the solution to, are being actively posted and on topic.
Personally this is what draws me to this site - a place where I can discover new puzzles to try to solve. I'm wondering how does this impact the traditional Q&A format? Should we have a tag for people wanting help vs. posting challenges?