Loyd's 15 is one of the most popular sliding puzzles of all time. Comprising 15 sliding tiles across a 4x4 grid, the missing "16th" number provided an empty space to move the tiles around the frame and solve the puzzle in a variety of solutions. Ever since its first introduction at the end of the 19th century, countless designs of the 15 Puzzle were created. One of such designs was made by Doug Engel, and I love its originality. It's made by BrainWright and it's called The Block & Roll Puzzle, and instead of numbers, you'll be playing with colored marbles.

So, how does this work? Is it just a simple exchange of numbers for colors? Well, not exactly. At first glance, there seems to be very few similarities between this puzzle and the classic version, besides the fact that you'll be sliding your way around a 4x4 grid. And indeed, the two puzzles couldn't be more different... and that's a good thing.

15 marbles make up the four groups of orange, yellow, purple and green colors. Unlike the original 15 Puzzle, here you'll be constrained by two barriers that will prevent you from freely navigate the marbles from one row to the other, just like a labyrinth. This is clearly seen in the photos, where two of the rows (one in the front and another in the back) have been cut in half and no marble can pass across it. This will, of course, raise the difficulty to a higher level than the original version.

One thing that I always like about puzzles is the ability to create patterns or to have multiple solutions. Here, The Block & Roll Puzzle does this in great style, as it offers you 44 different challenges with patterns to reproduce exactly as you see them. The challenges will be quite difficult, as the first two challenges seen in the photos took me around 30 minutes to solve. Not a bad thing, though, since I like a good challenge.

Closing Comments:

Loyd's 15 The Block & Roll Puzzle is yet another great sliding puzzle that I'm happy to add to my collection. The concept is different from what I'm used to see in sliding puzzles, and the high difficulty will certainly test your patience and solving skills. Definitely recommended.

Availability: The Block & Roll Puzzle can be found at PuzzleMaster for just $14.99 CAD. Check out other cool puzzles by BrainWright.