Press the green flag and use your cursor to guide Mr. Tweet to the Green line (it will switch sides every time your score is increased). Get a score of 5 to win the game and to stop pollution. If you want to skip the intro, press the "m" key for mindstorms.
This serious game gives a little background to pollution and global warming. For more information, you may visit http://www.livescience.com/22728-pollution-facts.html and http://environment.nationalgeographic.com/environment/global-warming/pollution-overview/
