The aim of pluzzle is to move all the tiles into numerical order, from left to right and top to bottom, leaving the bottom right square empty. You do this by simply dragging the tiles, or by clicking a tile to move it into an adjacent empty space. You can even move collections of tiles by grabbing one end and pushing the other tiles.
A similar software puzzle was included in the original Apple Macintosh computer, released in 1984 (there is an amazing story of how the creator managed to fit it in 600 bytes of memory!) It was a favorite for many years, but now returns in a new form for Mac OS X users to enjoy! Now, get pluzzling!