Geometric arrangements of coins can serve as the basis for all sorts of puzzles. One popular variant involves going from one configuration to another by sliding coins, subject to given constraints, ...

Brain teasers are puzzles specifically designed to challenge your thinking and problem-solving skills. These puzzles often require logical and creative approaches to finding the solution. This ...

Thirty €1 coins are arranged in a circle on a table. Ten of these coins are fake and a little lighter than the 20 real coins. You don’t know where in the circle the fake coins are, but you have been ...