Sliding puzzles can be incredibly difficult to solve, as anyone who's tried can tell you. Mathematicians categorize sliders as PSPACE-complete, which is a measure of their mathematical complexity. Essentially, it means that even computers find it hard to come up with a solution [source: Hearn].

There is no universal rule that lets you solve a sliding puzzle, though many stumped players wish there were. As you work on a succession of sliders, you tend to develop an intuition about how to move pieces around the playing space. You'll get better, but each puzzle will still be a challenge.

The 15-type sliding puzzle, because all of its pieces are squares, is one of the most straightforward to solve. If you need some help, here are a few hints:

- Begin by maneuvering the 1 and 2 into their proper positions in the upper left corner.
- Position the 3 in the upper right corner.
- Maneuver the 4 under the 3
- Now slide the 3 to the left and the 4 up; the first row is done.
- Repeat this process with next row, leaving row above intact.
- Complete the puzzle by rearranging the pieces in the last two rows until they are in position.
- Sometimes it's easier to create "snakes" of pieces in the proper order rather than put them in their final position individually.
- If you're assembling a picture, study the design carefully before it's scrambled. It's harder to solve if you're not clear about the final outcome.

While you can find walkthrough solutions to some sliding puzzles on the Internet, most players aren't interested in getting help. The fun of sliders comes from the "eureka!" moment when you finally stumble on the solution. One general rule is that it can be helpful to concentrate on solving individual areas of the puzzle, while always keeping the larger picture in mind. You might start with one row or a particular corner.

The real secret that applies to solving every sliding puzzle ever invented can be summed up in one word: patience. Keep trying. The longer it takes, the more satisfying the solution.

Move on to read about a lot more fascinating info about sliding puzzles.

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