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With few guests, the hotel can avoid filling up any three adjacent rooms in a row. How many guests make it impossible?

Solving a Grid Fill puzzle involves logic and arithmetic. How can you make both rows sum to 6?

We can infer a lot about the relationship between two angles in this circle with just a few angle facts. Which angle is larger?

When counting elements of a set, we need to make sure we don't count some of them twice. In how many ways can Sekou avoid trouble?

To fill in a graph so that adjacent regions are different colors, we need at most 4 colors. Is this true for a graph that’s been partially filled in?

This Calcdoku doesn’t have many clues, but that can make it easier to find a place to start. Which gives you more information — a sum or a product?

A newscaster is interviewing four people who won the lottery. How much did an interviewee win, and which state are they from?

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