One More Digit - Memory Math

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.