The first game I played was called 'click for Obama'. The object of the game was to answer questions based on politics and politicians around the world, for every question answered correctly 500 pixels were donated to an Obama ad. The game promotes Obama's campaign and his views, therefore making the game and advergame.
The second game I played was called 'Free Rice'. Before you start the game, you get to pick what type of questions you want to answer such as: Vocabulary, Chemistry, Math, Languages, or even famous paintings. Once you have picked the subject you start answering questions, much like in Obama's game, and for every question answered correctly a certain amount of rice grains are donated to third world countries. This game can be considered as both an advergame and a persuasive game, in that the game promotes helping third world countries, and also advertises the free rice union.
The last game I played was 'Darfur is Dying'. The object of the game is to get an innocent child or woman to the border, all while avoiding the hunters. If the carachter is caught you're given two choices, go to the camp to die, or start over again. Further in the game you are asked to send a letter to a congressman conserning the genocide in Darfur. The game truely displays how horrific it is to live in Darfur now, and inspires us to help, thus making it an Educational or Serious game.