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Different configurations of springs have different elasticity constants. Which one is impossible?

Although some games look similar, the probabilities of winning them aren't always the same. Is it the case in today's challenge?

Solve this Calcdoku puzzle using careful logic and attention to the properties of arithmetic.

Each time the ball bounces up, it loses some percentage of its energy. What percentage?

By extending the sides of regular polygons, we can create interesting star patterns. What happens when we start shading them?

By surveying a carefully chosen sample, one can draw conclusions about a larger group. How big must the sample be?

In a jigsaw map, you must arrange puzzle pieces according to clues. How do these pieces fit together?

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