What is Undo?

Undo is the game built to test and beat AI brain fry: a free daily brain workout you do without AI. One card a day, five short rounds, about ten minutes. Everyone gets the same card.

Play today’s card

What are the five rounds?

Catch It: eight claims, some are bluffs, and you call each one. Ballpark: three numbers you can’t look up, and you give a low and a high. Stuck: one hard problem, where hints cost points. Blank Page: one question, answered in 30 to 90 of your own words. From Memory: a card you read at the start comes back with holes in it.

Why no AI?

Studies from MIT, Wharton, Microsoft and others have found that people who lean on AI remember less of their own work, check less, and do worse when the AI is taken away. Undo is practice at the thinking people now hand over: checking, estimating, solving, arguing and remembering.

Does Undo make you smarter?

We claim one thing: you get better at what you practise. Undo is a game, not a treatment, and your FQ is a game score, not a diagnosis.

What is the fry test, and what is FQ?

A one-minute test that gives you your FQ, short for Fried Quotient: how fried your brain is, from 0 to 100. Lower is better. After that, each daily card moves it up or down.

Is Undo free?

Yes. The daily card is free and needs no account. An optional $5 a month plan adds up to five extra practice cards a day.

Do I need an account or an app?

No. Undo runs in your web browser on a phone or a computer, and your progress is saved in that browser. You can add it to your home screen.

Can I play with friends?

Yes. Start a league from the Board and send the invite link. Up to 50 people can join, with a daily board and a weekly table. You can also send a friend a challenge link to beat your score.

When does a new card come out?

At midnight, your time. Miss a day and a rain check can keep your streak.

The research behind it

Back to Undo · Privacy · Terms