Here is minimalistic implementation of Fifteen puzzle that you can try to solve just in your browser window. You can use it to spend some time or to investigate how to use the excellent jQuery library to create JavaScript applications. The game internally consists of two modules: model that stores game data and UI that build with jQuery and contains only 26 lines of code.
Available as Google Gadget, which you can add on your iGoogle.
Click on square around missed square to move it. Click Shuffle to reorder the squares.
Game source code (hosted by Google Code)
If you like this game you can add it on your site by using the following code: