Last year, I solved 9 Harvard puzzles.
Thought that was my ceiling. 😅
This year I came back, sat down with my team, and solved all 10.
Certificate secured again. 🎓
But the stat that actually got me?
Pakistan again had the highest number of participants worldwide
in CS50x Harvard Puzzle Day 2026.
Out of every country on the planet.
Harvard also changed the cert policy this year.
Everyone who submits now gets a certificate, regardless of how many puzzles they solved.
More people in. Bigger community. Love that.
None of this happens without my team.
They made 10 puzzles feel like a good time. 🙌
Big thanks to my teammates <a href="https://www.linkedin.com/feed/update/urn:li:activity:7448674364629307392/?commentUrn=urn%3Ali%3Acomment%3A(ugcPost%3A7448674363341459456%2C7448676272232091648)&amp;dashCommentUrn=urn%3Ali%3Afsd_comment%3A(7448676272232091648%2Curn%3Ali%3AugcPost%3A7448674363341459456)#" target="_blank" rel="noopener nofollow">Tayyab Nisar</a>, <a href="https://www.linkedin.com/feed/update/urn:li:activity:7448674364629307392/?commentUrn=urn%3Ali%3Acomment%3A(ugcPost%3A7448674363341459456%2C7448676272232091648)&amp;dashCommentUrn=urn%3Ali%3Afsd_comment%3A(7448676272232091648%2Curn%3Ali%3AugcPost%3A7448674363341459456)#" target="_blank" rel="noopener nofollow">Zeeshan Younas</a>, and <a href="https://www.linkedin.com/feed/update/urn:li:activity:7448674364629307392/?commentUrn=urn%3Ali%3Acomment%3A(ugcPost%3A7448674363341459456%2C7448676272232091648)&amp;dashCommentUrn=urn%3Ali%3Afsd_comment%3A(7448676272232091648%2Curn%3Ali%3AugcPost%3A7448674363341459456)#" target="_blank" rel="noopener nofollow">Muhammad Umer Mubarik</a> for staying sharp till the last puzzle, and to <a href="https://www.linkedin.com/feed/update/urn:li:activity:7448674364629307392/?commentUrn=urn%3Ali%3Acomment%3A(ugcPost%3A7448674363341459456%2C7448676272232091648)&amp;dashCommentUrn=urn%3Ali%3Afsd_comment%3A(7448676272232091648%2Curn%3Ali%3AugcPost%3A7448674363341459456)#" target="_blank" rel="noopener nofollow">iCodeGuru</a> for the push.
<a href="https://www.linkedin.com/feed/update/urn:li:activity:7448674364629307392/?commentUrn=urn%3Ali%3Acomment%3A(ugcPost%3A7448674363341459456%2C7448676272232091648)&amp;dashCommentUrn=urn%3Ali%3Afsd_comment%3A(7448676272232091648%2Curn%3Ali%3AugcPost%3A7448674363341459456)#" target="_blank" rel="noopener nofollow">Harvard University</a>, <a href="https://www.linkedin.com/feed/update/urn:li:activity:7448674364629307392/?commentUrn=urn%3Ali%3Acomment%3A(ugcPost%3A7448674363341459456%2C7448676272232091648)&amp;dashCommentUrn=urn%3Ali%3Afsd_comment%3A(7448676272232091648%2Curn%3Ali%3AugcPost%3A7448674363341459456)#" target="_blank" rel="noopener nofollow">CS50</a>, Sir <a href="https://www.linkedin.com/feed/update/urn:li:activity:7448674364629307392/?commentUrn=urn%3Ali%3Acomment%3A(ugcPost%3A7448674363341459456%2C7448676272232091648)&amp;dashCommentUrn=urn%3Ali%3Afsd_comment%3A(7448676272232091648%2Curn%3Ali%3AugcPost%3A7448674363341459456)#" target="_blank" rel="noopener nofollow">David J. Malan</a> — grateful this is free for anyone, anywhere.
Year 3, let’s go. 🚀
Did you take part this year? 👇
#CS50xPuzzleDay #HarvardUniversity #CS50 #Pakistan #iCodeGuru #ProblemSolving #PuzzleDay2026

Usama

A developer shares their experience winning the Harvard CS50x Puzzle Day 2026, completing all 10 puzzles with their team. They highlight that Pakistan had the highest number of participants worldwide and note Harvard's new certificate policy allowing everyone who submits to receive a certificate regardless of how many puzzles they solved.

Won Harvard CS50x puzzle day 2026