Snake: Flash game + tutorial
This version of the classic game of Snake is remarkable in that it comes with source code and a complete tutorial explaining the code by its author, Strille of Sweden. Available on his website, the tutorial is a great way for anyone to get started programming games in Flash. The code is simple and straightforward for even a novice to understand, and it features an excellent design, as well as some very good examples of maintaining game state data in arrays.
The link to the game, also from Strille's website, is an enhanced version of the one featured in the tutorial. Included is a high score list with which you can view an instant replay of any of the games in the list. Simply click the "view" link next to the score you want to see the replay for. The enhanced version also features an instant replay of your own game once you finish. Kudos to Strille for both sharing his code, and for the excellent additions to this classic game. Click.