My friend, Thetis, and I constantly play with puzzles. She's addicted to Tapa Puzzles of various kinds, and she has hundred of booklets filled to the brim with these playful, little logic games. But just the other day, Thetis looked like the black dog walked all over her; she told me some guy ga...

Given the country codes of 10 countries in the chart below, can you figure out the country code of Brazil? $ \begin{gather} % custom template - reuse if you may \def\S#1#2{\Space{#1}{19px}{#2px}}\def\P#1{\V{#1em}}\def\V#1{\S{#1}{9}} \def\T{\color{white}{\textbf{ Country }}}\def\NT{\color{white}{...

I've come up with a riddle that I use on a daily basis to solve a simple problem. In a kitchen, you have a water crane that can run cold and hot water (or a mixture). The more fancy ones have a handle that can rotate in 360 degrees where horizontal movement determines the temperature, and the ve...

It is well-known that the minimum number of clues that completely specify a 9 x 9 Sudoku is 17. What is the minimum number of clues required for a 16 x 16 Sudoku whose cells contain one of the integers 1 to 9, or the letters a to g?

Create all numbers from $101$ to $200$ using the numbers $1$,$3$,$3$ and $7$. You can only use each number once, except for the 3, of which you have two. You can use addition $(x+y)$, subtraction $(x−y)$, division $(\frac x y)$, multiplication $(x×y)$, exponentiation $(x^y)$, roots $(y\sqrt x)$...

Who has trapped me inside my home Goes around the world oftenly alone. In the last year plan Was that place so good Got her name From some kind of wood Almost with all of them She shares her self Except two of them Where we cannot help One of them I put in my dish All teams should guess this Th...

Here is a riddle written on a cup: Eh is four times as much as Oi, Oh is four times as little as Ai, What do you get if you add all four of them up?

What are the new numbers from top to bottom when you add the matches in the picture puzzle? *

As an hommage to @eyl327's "can you name the country code?" puzzles. Here is one more: Given the country codes of the 10 countries in the following table, can you figure out the country code of Germany? Bhutan TGH Gabon AFE Zimbabwe WIG Urugua...

A country was named after someone with a certain given name; its capital was named after someone with a certain surname. The aforementioned names are the same. Identify the country, capital, and people referred to.

This number in some way represents 4 commonly used colors: 25536, 187669382, 3043469, 11599 Can you decode it? Include the answer and your thought process to get the check mark. Let me know if you need more hints. Hint 1:

Continuing along the 'lines' of this puzzle - Such a simple task! This time around Darlene couldn't be happier. Jimmy managed to build the pig pen to the specs he was given, but he still doesn't know what it says! Seems like Darlene is having some fun with him - can you help Jimmy find out what ...