When all else fails, just fly around the world until you see the correct city. You will need a Java capable browser. The age-old puzzle of the Tower of Hanoi. This game will make every little nuance glaringly obvious. Make sure your browser is Java capable.
Interface is a little slow to load, but is fun to play.
Not exactly action-packed, but it is multiplayer, and some people like to calculate trajectory. You will need a Java-capable browser. After your first move, they change into exit squares. The game is over. This will release balls that need to be matched to their appropriate color.