A sliding puzzle is a game where you must re-arrange the mixed-up pieces into a sequence. The arranged sequence could be a set of numbers or an image. The challenge is that you must re-arrange the pieces by sliding them on the board, using a single empty space, without lifting the pieces up.
The sliding puzzles on this web-site require Java plug-in for your browser to run. If you don't see the sliding puzzle, then you may need to install the Java plug-in. See "Easiest Way to Install Java for a Browser" for help on installing the Java plug-in.