(Click to Enlarge)

Made with four sliding laser-cut wooden plates, the N5 is a small puzzle, measuring just 8cm in diameter. The plates are placed in pairs perpendicular to each other. The top plates have four small mazes that have different paths, navigated by four pins. The goal is to slide the plates until you can free the small metal sphere trapped under them.

The puzzle looks a bit complex at first, but you'll soon find out that it's actually quite easy to solve, especially if you're used to sequential movement puzzles. I counted 22 moves until I could remove the sphere from the puzzle, but it could be even less. It can be solved within five minutes, and within one minute when you know the moves by heart.

I found it a bit more difficult to put the puzzle back to its original state, but I believe it was because I didn't know the moves by heart. Once you do, it's as easy to solve as it is to put it back. The difficulty level is 8/10, but I reckon it should be more about 7/10. The sequential movement is classified as 3-ary, or ternary (three states, as opposed to the binary's two states).

(Click to Enlarge) - Solved Position

I really liked the N-5 by Constantin. It's an easy puzzle to solve at any time without frustration, but still very fun to play with. Also, with just 20+ moves you can easily set it up for someone else to try it. This is recommended for beginners to practice, because there are bigger versions of this puzzle with much more moves (hundreds of moves).

Availability: You can find the N-5 puzzle at PuzzleMaster for $23.99 CAD. Check out other interesting puzzles by Jean Claude Constantin.