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Riddles, one at a time

Which card completes the grid?

Video · Genius Challenge link
Answer

D

In each row, only lines on both cards stay. Row 3 gives card D.

What comes next? 2, 6, 12, 20, 30, ?

Text · Easy Challenge link
Answer

42

The gaps grow by two each time: +4, +6, +8, +10, then +12. 30 + 12 = 42.

Move exactly one rod. What is the true equation?

Video · Medium Challenge link
Answer

9 − 8 = 1

The top rod of the 7 turns the 3 into a 9.

Which row of lamps shows 22?

Video · Hard Challenge link
Answer

A

16 + 4 + 2 = 22. B is 26, C is 14, D is 21.

Moving only right or up, how many different routes lead from start to the gem?

Video · Hard Challenge link
Answer

8

There are 20 routes in all, and 12 of them pass the cone: 20 − 12 = 8.

How many more km until the next mirror number?

Video · Medium Challenge link
Answer

110 km

The next mirror number is 16061: 16061 − 15951 = 110.

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