Beginner puzzle This puzzle is intended to be suitable for people who are new to puzzle solving. Clarification: Both experienced solvers and new solvers are welcome to post solutions to this puzzle. Each of the shapes shown has been made from four unit cubes. For each shape, Max takes eight copi...

Stack Exchange users who have not uploaded a personal profile picture will have their generated identicon as their avatar. Inspired by this, I decided to create my own identicon specification. It takes a string, hashes it into a 64-bit value (exact method not important for this puzzle), then gene...

This continues from the 1st part of this series. After I emailed the stranger telling him what he actually did was just to he sent me an email in reply. It read as follows: Hi there, Well done on solving my first puzzle for you! The next step is to come to the door at [redacted], and you need ...

Players There are total three players split in two teams Team Resistance has two players whose roles are assigned at the start of the game Team Spy has one player Before starting the game Both resistance players must agree what Strategy they will follow during the game. The spy must be made aw...

Bernardo, hb!!! This is a Colombian sudoku made in honor of my friend Bernardo Recamán, for his birthday. Complete the sudoku on the left so that each row, column, 3x3 square, and cell of the same color contains the numbers from 1 to 9. The dots indicate how many numbers in the row or column of t...

You stand before an omniscient being. It is either God, who always tells the truth, or the Devil, who always lies. You don't know which. Your task is to figure out whether Heaven is real. You may ask the being one yes-or-no question in English. (Questions using coercive logic are not permitted.) ...