I ask Joseph to pick any 5 cards out of a deck with no Jokers.

He can inspect then shuffle the deck before picking any five cards. He picks out 5 cards then hands them to me (Jack can't see any of this). I look at the cards and I pick 1 card out and give it back to Joseph. I then arrange the other four cards in a special way, and give those 4 cards all face down, and in a neat pile, to Jack.

Jack looks at the 4 cards i gave him, and says out loud which card Joseph is holding (suit and number). How?

The solution uses pure logic, not sleight of hand. All Jack needs to know is the order of the cards and what is on their face, nothing more.

Count the squares in the matchstick puzzle below?

What has 88 keys?

Can you count the number of lines in the below picture?

Rearrange the letters in "new door" to make one word.

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

Identify the 10 differences between the two given pictures.

10+10 and 11+11 can give you the same answer.

Explain how?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?