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A game called Plants vs. Zombies offers a fun variation on the tower defense game: flower defense. Zombies attack, and your job is to stop them by planting vegetation that stops, maims or destroys them. Now, the same game is available for the iPhone, for a competitive price of $2.99.
Features include the 50 level long Adventure mode (with the ability to replay levels via the Quick Play Arena), more than four dozen different plants, dozens of zombie types and lots of achievements that reward successful completion of various challenges.