
The place for mathematical puzzles and the puzzling community. Two new puzzles every Friday morning!
| Platform | Pricing | Freemium | Publishes | Weekly | |
|---|---|---|---|---|---|
| Issues | 154 | Founded | 3 years ago | Last Issue | 5 days ago |
| Active | |||||

A big wave makes landfall on a semicircular island and leaves the island 10 minutes later. What stretch of land might it cover 5 minutes after landfall?
Welcome to Fiddler on the Proof, the spiritual successor to FiveThirtyEight’s The Ridd...
Three game show contestants must use logic to determine the color the hat on their head.
Welcome to Fiddler on the Proof, the spiritual successor to FiveThirtyEight’s The Riddler column.
Some sheep are positioned and oriented randomly in a pen. What’s the probability that each sheep can see all the other sheep?
Welcome to Fiddler on the Proof, the spiritual successor to FiveThirtyEight’s The Riddler column.
June the hungry ant is traveling across the surface of a cylinder to reach her dinner. How fast can she get there?
Welcome to Fiddler on the Proof, the spiritual successor to FiveThirtyEight’s The Riddler column.
My nephew is hiding at one of three possible locations. How efficiently can I find him? (And what if he has a teleporter?)
Welcome to Fiddler on the Proof, the spiritual successor to FiveThirtyEight’s The Riddler column.
Subscribers, engagement, traffic and sponsorship for Fiddler on the Proof.
| Subscribers | Engagement | 76 | Monthly Web Visits | ||
|---|---|---|---|---|---|
| Accepts Sponsors | Estimated Cost per Ad | ||||
How this newsletter ranks in the official Substack charts.
| #89 | |
| #87 |
The writers behind this newsletter.
Former Puzzle Editor @FiveThirtyEight; VP STEM @Amplify; Co-Founder @SchoolYourself
You can find recent issues that have been published by Fiddler on the Proof on Reletter by scrolling up to where it says Latest Issues. Tap on the link for any of the most recent emails or hit More Issues to see older ones.
To see how many people subscribe to Fiddler on the Proof, simply upgrade your Reletter account. We provide readership numbers and lots of other stats for this newsletter so you can decide if it's worth reaching out to.
Newsletter advertising can be extremely effective when it's done right. Before you pitch Fiddler on the Proof as a potential sponsor or partner, make sure that you've done your research and checked its newsletter stats with Reletter.
Then, personalize one of our winning pitching templates and send it to the right person using the contact info provided.
Newsletter ad rates (or CPM) vary depending on many factors, including industry, number of subscribers, open rate, ad placement and more.
To find out how much an ad will cost, contact Fiddler on the Proof using the contact information provided and ask for a copy of their media kit.
Scroll up to where it says Related Newsletters to see other publications like Fiddler on the Proof. You can also search our email newsletter directory to discover other newsletters that cover the topics you're interested in.
Reletter provides this newsletter's website URL above, where you will often find their contact information. We also provide links to associated social media accounts and pitching templates so you can reach out fast.