Pyramid Maze: Solve the pyramid, then trace the maze: one legal path from IN to OUT. This is one of the many kinds of math pyramid we make, and here is how it works, with a video, a worked sample and a pyramid you can try right on this page.
The rule
Step from brick to a touching brick, always following the rule: odd, even, odd, even.
A worked sample
The start is forced
You enter at the top, 35, which is odd, so the next number must be even. Of its two neighbours, 24 is even and 11 is odd. Only 24 works. From 24, next must be odd: 11, not 16 or 8.
Then 8
From 11 (odd) the touching bricks are 24 (visited), 8 and 3. 3 is odd, so the only even one is 8.
A real choice
From 8 (even) three bricks are odd: 3, 7 and 1. 3 and 1 both lead into a corner with no way out. 7 goes on: 7 → 16 (even) → 9 (odd), and 9 is the OUT door.
Your turn
Try it: find the one legal path
Tap the bricks in order, starting at IN and ending at OUT. Each step must touch the last brick and follow the rule: odd, even, odd, even.
Why it is worth doing
A maze that you solve by rule, not by trial: look at each step, rule out the bricks that break the pattern, and the path appears.
Books mentioned

Math Pyramid Maze
100 two-in-one puzzles: solve the pyramid first, then trace the maze through it. Full solutions are in the back.
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