XV (15 Puzzle) for Mac

From LorenB software:

XV is a Mac OS X version of the classic 15-Puzzle. The goal of the puzzle is to reorder a bunch of blocks. To play, Click on "Shuffle" from the "Game" menu. You will see a bunch of blocks with 1 empty square. Click on squares adjacent to the blank to shift that block into the space... repeat until solved!

Nothing too fancy here, just good old fashioned puzzle fun :)