title: iPhone Tile-based game board question
body: <p>Let's say you have a game board where you have tiles, like those where its a picture and its scrambled but you have one empty tile.  So you drag a tile around until you can reassemble the picture.  You have a 3x3 or 4x4 (doesnt matter) matrix with one empty square. </p>
  
  <p>example:</p>
  
  <p><a href="http://www.kirix.com/extensions/sliding-tile-picture-puzzle/" rel="nofollow noreferrer">http://www.kirix.com/extensions/sliding-tile-picture-puzzle/</a></p>
  
  <p>What I'm interested in is the mechanics of the dragging and placing.  So you select a tile next to the blank spot, and drag it to the open spot and release.  it then 'stays' put.  </p>
  
  <p>has anyone a source example of such a game?  </p>