We Love Countdown's Numbers Round, and Made It Friendlier

Steve and Tui are both big fans of Countdown, the British TV game show, and its numbers round (also called the maths round): two contestants racing the clock to wrestle six numbers into an equation, then revealing what they've got. Good nerdy fun, and a winning formula for the whole family. That's exactly the feeling we wanted Rigid Digit to keep, and the result is a super fun, addictive game made for casual play, for kids and adults alike.

Before Countdown: Des chiffres et des lettres

Countdown didn't invent the numbers round either. The show is a British adaptation of Des chiffres et des lettres, the French game show that ran almost continuously from 1965 to 2024. The letters game came first; the numbers game, Le compte est bon (the total is right), was added in 1972, and it's that pair of rounds Countdown took on when it opened Channel 4 on 2 November 1982.

Plenty of countries have their own version of it: Cifras y letras in Spain, Letters and Numbers in Australia, and others in Denmark, Greece, Italy, the Netherlands and beyond. Sixty years on, Rigid Digit is one more branch of that family tree, still built on the same idea: hit the target number with the numbers you're dealt.

What We Changed, and Why

We loved the bones of it enough to build a whole game around them. A few things we changed:

• No ticking clock. Thirty seconds against a countdown makes great TV, but it's stressful for a kid (or a parent) doing mental maths under pressure. We track your time quietly in the background instead, so the puzzle's still there to beat, it just never rushes you.
• Every puzzle is solvable. On the show, the numbers are drawn cold, and sometimes there's no exact answer at all. Every Rigid Digit puzzle is checked by a solver before it's published, so if you can't find the exact number, that's on you, not the draw.
• You don't have to be "good at maths." There's no wrong way to get there. If you can add and subtract, you can brute-force your way to an answer just by trying combinations until one clicks, no mental arithmetic gymnastics required, just patience.
• Solo, not head-to-head. No opponent to beat, no one else's score to catch. It's still fun to compare notes with family and friends afterward (that's what the share button's for), just not a live race.
• Exact or nothing. The show still awards points for getting close, even on a miss. Rigid Digit only counts an exact hit as solved, which is where the 'Rigid' in the name comes from. There's no ambiguity about whether you actually got it.
• Instant, and reversible. Tap two numbers and the maths happens for you, correctly, so exploring costs nothing but taps. If a path doesn't work out, split that move back apart and try again instead of crossing it out and starting over.
• Five numbers, not six. Up to four steps instead of five. Four is roughly how much most people can keep in their head at once, so you can plan a whole solution without losing track of the start.
• A gentler way in. On the show, the target is always a three-digit number. Rigid Digit's Medium, Hard and Extreme levels keep that, but Easy always has a target under 100, which makes it a great warm-up, and a friendly starting point for younger players. And where the show lets contestants choose how many large numbers (25, 50, 75, 100) they get, here the difficulty picks for you: two on Easy, one on Medium, none on Hard or Extreme.
• A new set of puzzles every day. Four of them, actually, one per difficulty, Wordle-style. Everyone's comparing notes on the same ones each day, and you can play as many as you like.

Coming to numbers puzzles by way of the 24 Game or NYT's Digits instead of Countdown? Rigid Digit will feel just as familiar.