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Mind Reading

You keep the secret. The numbers do the talking. Every effect here works through real mathematics — and afterwards you can see exactly how.

• Play now

  Think of a Number

  Follow a few steps and I'll tell you where you ended up.

• Play now

  Guess My Birthday

  Do some arithmetic in secret. I'll name the day you were born.

• Coming soon

  Binary Number Cards

  Say yes or no to a few cards and your number appears.

  I'd play this
• Coming soon

  Remainder Mind Reader

  Three remainders are all it takes to find your number.

  I'd play this