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Solving a Calcdoku puzzle requires logic and arithmetic. In this one, the arithmetic focus is subtraction and division.

The rule for light reflecting off a single mirror is simple, but when you add a few more mirrors, pinpointing the source of an image gets trickier.

For this probability problem, you'd have a one-in-four chance of being correct if you guessed the answer at random.

Distinguishing between true and false statements can help us get to other information, too. Which chests have gold in them?

Two gears in a system rotate in opposite directions. What happens when you add another gear?

There are lots of ways to add to nine, but is it possible to make it happen twice in this puzzle?

Even without knowing the measure of any one angle, we can sometimes find relationships between them. What are these angles?

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