## Last Chocolate Game

Two friends are playing a game with two boxes of chocolates. They take turns taking out some number of chocolates from the boxes, and whoever takes the last chocolate wins. Each turn they can take chocolates one of two ways:…

## Vacant Room Probability

Your workplace has a phone room for employees to quietly make personal calls. The room has no windows, just a sign that can be switched from “Vacant” to “Occupied”. However, employees differ in how consistently they use the sign: 1/2…

## Break the Cipher

The CIA is tracking a criminal organization and have reason to believe they are about to launch some sort of attack on New York City. One morning, they intercept this message, can you break the cipher and figure out what…

## Random Turns

You are in a city with streets on a perfect grid – every street is north-south or east-west. You are are driving north, and decide to randomly turn left or right with equal probability at the next 10 intersections. After…

Tread on the living, they utter not a mumble. Tread on the dead, they mutter and grumble. What are they?

## Water Jug Riddle

You have a 3-litre jug and a 5-litre jug, and as much water as you need. How do you measure out exactly 4 litres using only these two jugs? This is a classic logic puzzle, sometimes used in finance and…

## Impossible Sudoku

You may be familiar with Sudoku, a combinatorial number placement puzzle in which you fill in a 9×9 grid with digits such that each row, column, and 3×3 square contains all of the digits 1-9 exactly once. You come across…

## Four Triangles with Matches

Move exactly 3 matches to make these three equilateral triangles into four equilateral triangles of any size, without any matches crossing or overlapping.

Berkson’s Paradox is a counterintuitive or unexpected trend observed in a sample due to a particular type of selection bias. This bias arises when the sample is selected based on the combination of two characteristics. Also known as Berkson’s bias…

## Proverb Missing Vowels

This fairly common proverb is missing its vowels. What is the original proverb? PPRNCS CN B DCPTV

## Fix the Equation

Make the following line a valid equation using only these mathematical operators: addition, subtraction, multiplication, division, parentheses, exponentiation, square root, and factorial. 2 2 2 2 = 50

## Word to Complete Them All

I _ _ _ EW _ _ _ HC A _ _ _C _ _ _ E R_ _ _ I O Which 3-letter word can be inserted into all four lines above to form complete words?

## Balloon Direction Puzzle

You are driving your niece to a birthday party, and she is bringing a floating balloon filled with helium. When you make a sharp left turn, you both shift to the right. Which way does the balloon shift? Assume the…

## Pirate Survivor Puzzle

The democratic pirates are at it again! Since last time, they have become very successful and have now expanded to 100 pirates. They decide this is too large of a group for plundering, so true to their democratic roots, they…