What's New
New features, stories from the community, and the odd personal thought about maths and games.
28 October 2026
Medium Was Harder Than Hard. Not Any More.
Our own stats showed more of you solving Hard puzzles than Medium ones. Here's why, and what we changed.
26 October 2026
Puzzle Solvers We Love to Watch
The YouTubers and maths people we watch to see how someone else got to the answer, dead ends and all.
25 October 2026
Daily Puzzles to Play With Your Kids
The puzzles Tui and I play over breakfast and on weekends, because a search for kids' puzzle games turns up a lot you wouldn't hand a child.
23 October 2026
What's Next for Rigid Digit?
Proper phone apps, a version for schools, or a home at a big puzzle site? We've got a few ideas about where to go from here, and we'd like your vote.
6 October 2026
Mental Maths Tips and Tricks
The tricks we lean on to crack a Rigid Digit puzzle in our heads, and plenty that work just as well at the shops.
5 October 2026
Help Us Name Our Algorithm
Countdown's numbers round had CECIL. The program that builds every Rigid Digit puzzle doesn't have a name yet, and we'd love your help picking one.
18 September 2026
You Don't Suck at Maths
The most common reaction to Rigid Digit is "I suck at maths." Probably not true, and even if it were, that's rather the point.
17 September 2026
Rigid Digit Goes to School
Tui's school shared Rigid Digit ahead of their Mathathon fundraiser, which got me thinking about screens, kids, and when the two are actually a good mix.
16 September 2026
Chase the Flame
The flame isn't just decoration. It's proof you did the maths in your head, fast.
15 September 2026
Now Easier to Brag About Your Best Solve
A solved puzzle always turns into a bit of family bragging around here, and the share sheet just got quicker to use.
15 September 2026
Meet Acer, Our Favourite Four-Year-Old Numbers Whiz
A four-year-old Countdown Numbers Game solver whose mental maths genuinely has to be seen to be believed.
14 September 2026
How Many Ways Can You Solve This?
Same five numbers, same target, and we keep finding new ways to reach it.
11 September 2026
Chain Mode
A few players asked for it, so it's there if you want it. We still prefer the default way ourselves.
15 August 2026
Why We Added Traditional Chinese
Tui is half-Taiwanese and learning to read and write it, and wanted a way to share the game with her cousins and friends in Taiwan.