One More Digit - Memory Math

Train your math memory. Recall it tomorrow — or sprint it in 60 seconds.

How good is your memory, really?

One More Digit gives you a number every day. Your job? Remember it until tomorrow. It sounds simple. It isn't.

Each day, a new number is revealed. Study it, lock it in your mind, and come back the next day to prove you remember it. No tricks, no shortcuts — just you and your memory. As your streak grows, so does the challenge. Start with 3 digits and work your way up to 7, 8, 9, and beyond. Miss a day or get it wrong, and you start over.

**How it works**
— A new number is revealed each day
— Study it for as long as you need
— Use your one peek if you need a reminder
— Come back the next day and type it from memory
— Get it right and your streak grows — and so does the number length

**Not in the mood to wait? Try Sprint.**
Sprint mode cuts the 24 hours down to 60 seconds. You'll memorize a number, work through a reverse counting challenge designed to actively disrupt your memory, then immediately try to recall it. Round after round, no waiting. The distraction is real — it's the same technique used in clinical memory assessments. Your Sprint streak is tracked separately, so your daily progress is always safe.

**Want real pressure? Challenge someone in Duel.**
Duel mode puts you head-to-head against another player. Same number, same distraction, one winner. Share a room code with a friend, memorize together, and race to recall. Both players get one attempt per round — a wrong answer hands the round to your opponent instantly. The digit count climbs each round, so if it goes to five, you're both recalling 7-digit numbers with someone watching. It's the most honest test of whether your memory is actually solid or just comfortable.

**Why One More Digit?**
— Builds real working memory over time
— Three modes: Daily, Sprint, and Duel
— Takes less than a minute a day
— No ads, no gimmicks, no endless levels
— A small but satisfying daily mental challenge

Your brain is a muscle. Give it something to hold onto.