This came in a magic trick box that our daughter picked for her birthday. Exhausted from all the Bar Mitzvah preparations for her older brother and her own demands for a Harry Potter birthday party, we didn't have any time to buy her a present or even think of anything original to serve as a present. As soon as she realized that no wrapped packages should be expected, she pragmatically proposed that on our next trip to a toy store she will pick something that she likes, I will wrap it and we all pretend it was a surprise.
She chose two sale boxes: one with a hundreds of hip-hop tattoos and another with magic tools. Among dice, fake nails and blood in the magic box there were these cards.
Now, pay attention, because it starts to be complex.
Our daughter, the magician, would ask you to think of a number between 1 and 63. Do not reveal this number!
Then, she will show you these cards, one-by-one.
After seeing each card you will say whether the number you picked is on this card or not.
And then, after these 6 yes-no answers, she will guess your number!
I pick 23.
She magically guesses: 23!
How does she know?
Quite simple. The instructions on this magic set tell her to add up all the left corner numbers from the "yes" cards.
Try it yourself and think how this could possibly work. Two puzzle points for any lead here.
Your answers are accepted any time until midnight Eastern Time on Sunday, on our Family Puzzle Marathon.