## Sicherman Dice

Sicherman dice are a particular pair of six-sided dice that, when rolled, produce sums with the same probability distribution as a pair of standard six-sided dice. In other words, these dice do not have the arrangement of 1, 2, 3,…

## Who Scored How Many Points

Lalo, Tyson, and Michael played a number of games of pick-up basketball. At the end, their combined points across all the games were: They noticed that in every game, one of them scored x points, one of them scored y…

## Double the Amount You Need to Do

At the beginning of January, you set a goal to work every day, to reach a total of 5000 minutes of work by the end of the month. But to give yourself a better shot of achieving this, you decide…

## Stranded in the Wilderness Brain Teaser

A man is stranded in the wilderness, in a remote northern area. There’s a lake nearby, and utility poles carrying electricity, presumably to a nearby town. However, there’s no way he can make it to the town in the freezing…

## Coin Rotation Paradox

The coin rotation paradox is a famous math problem with an unintuitive solution: If you roll a coin around the edge of another coin of the same size, from an external perspective, how many rotations does the coin make by…

## Five Points on a Line

There are five points on a line. You measure the distances between every pair of points and you find: 2, 4, 5, 7, 8, __, 13, 15, 17, 19 This list is ordered from shortest to longest. What is the…

## Doubling Game

Three players gamble on a “doubling game.” In each round of the game, a single loser is determined, and this player has to double the money of the other two. After three rounds of this game, each player has lost…

## Giant Cat Army Riddle from TED-Ed

In Dan Finkel’s TED-Ed video, he shares this math puzzle, paraphrased as follows: Dr. Schrödinger is creating an army of giant cats for villainous purposes. Your team of secret agents has located his lab, but needs to get through his…

## Boy or Girl Paradox

The “boy or girl paradox” is a well-known brain teaser by famous puzzle-maker Martin Gardner. It’s popularly considered a “paradox” because (1) it has a highly unintuitive solution, and (2) its ambiguous wording meant either of two solutions could be…

## Drink Half a Cup of Water

You drink half a cup of water. Then I drink half of what is left. Then you drink half of what is left after that, and I drink half of what is left after you drink. This continues until the…

## Two Envelopes Paradox

The two envelopes paradox is a famous brain teaser of sorts, and not a true paradox. The problem is generally posed like this: You are given a choice between two identical envelopes. One envelope contains some amount of money, and…

## Friedman Numbers

Friedman numbers are positive integers that can be written as an expression of its own digits and basic arithmetic operations. While Friedman numbers don’t have much practical use, they can be fun and creative puzzles for all ages! Rules of…

## Difficult Sam Loyd Chess Puzzle

In this highly difficult Sam Loyd chess puzzle from 1859, white to play and mate in 2. Sam Loyd was a widely acclaimed puzzle creator, known for his brilliant chess puzzles, visual puzzles, and math puzzles. Don’t be discouraged if…

## Honkai Star Rail Detector Thief

Honkai: Star Rail features a number of interesting logic puzzles in its quests. One side quest has you questioning suspects to determine the detector thief. Similar to some classic “who is lying” logic puzzles that you might have encountered before!…

## Honkai Star Rail Dissatisfied Cycrane Truth and Lie Riddle

In Honkai: Star Rail, one side quest takes you to solve a number of puzzles involving cycranes, including one fun and tricky Dissatisfied Cycrane truth and lie riddle! “I either can only tell the truth, can only tell lies, or…

## Honkai Star Rail Ministry of Education Quiz Answers

Ministry of Education Quiz Honkai: Star Rail is the latest mobile game by the creators of Genshin Impact, and shortly into your gameplay, you’ll run into the Ministry of Education quiz as part of your daily quest. Over the course…

## Mystery Killer Riddle

A detective is called upon to solve the riddle of the mystery killer in a high-profile murder. There are only three suspects: The victim was holding a calendar, and it seems he marked several of dates before he passed away:…

## 6 Tricky Lying Thief Riddles

These lying thief riddles are fun and tricky logic puzzles that will test your brain. In each puzzle, you interrogate a number of suspects, knowing that some of them are lying, and use that information and your deduction skills to…

## 5 Quant Brain Teasers

Whether you’re preparing for an interview or just trying to keep your mind sharp, here are some quant brain teasers to test your skills. Remember, if you get a brain teaser at an interview, you don’t necessarily need to get…

## Speak Both Languages

In a certain classroom, 75% of the students can speak English, 55% of the students can speak French, and 10% speak neither language. What percentage of the students speak both languages?