# Droodles

Did you ever notice that people often draw all kinds of figures during meetings? Here are some coded, abstract droodles.

There is a hint

# Number squares

1) Number square*
Find the missing number:

solution: Here)

# Pattern code – arrows

Here are some arrows, all different, and all labelled.

What should be the label of the arrow in the center?

You can check your solution here

# Optician

At the optician, I saw several spectacles for sale. The prices of the frames, still without the glasses, showed a very clear pattern.

What is the price of the one labelled with the question marks?

Usually you can find a new braintease here usually on Friday. Solutions are generally provided one week later.

You can check your solution here

# What comes next?

Substitute digits for the question marks:

149 162 536 496 481 ???

This problem was posed before in the British magazine Games and Puzzles, issue 44, 1976, in a slight variation.

You can check your solution at here

# Pattern codes – circles

1) Circles**

Which code belongs at the question mark?
If you wish, you can peek at a hint

I have long suspected that there is a strong connection between mathematics and puzzles. Proving such a relation according to the scientific standards is of course another matter. It was nice to read that a study by the University of Chicago found that puzzle play helps boost Learning Math-Related skills in children between ages 2 and 4.

# Masonry

The advertisement flyer of the contractor showed me several examples of masonry, with bricks in two colours: brown and yellow.

Which code should be substituted for the question marks?

You can look up a hint

Puzzlers are likely to value their brain power. So I’ll take this opportunity by passing on some research results: walking increases your memory

# What comes next?

What comes next in the following sequence?

4 3 3 5 4 4 3 5 5 4 3 ..

If you think you found the solution, you can check the solution

# Where does the zero go?

Where does the zero go in this sequence?

8 5 4 9 1 7 6 3 2

I would like to thank fellow consultant Harrie Jans for coming up with this little poser ðŸ™‚

If you solved it, we have the solution so you can check yours.

# Pattern code snakes

1) Snakes
What is the code that goes into the question mark?