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This is a very popular game. Very fun and addicting. Game is also available for Mac.
Use coupon code holiday4 to get it for $3.49.
This is a blurb from wikipedia:
Plants vs. Zombies is a tower defense video game developed and originally published by PopCap Games for Microsoft Windows and Mac OS X systems. The game involves a homeowner using many varieties of plants to repel an army of zombies. The homeowner, along with a neighbor called Crazy Dave, must defend the homeowner’s house during day or night, in the front yard and the backyard (which contains a swimming pool), and even on the roof.
You can check out the review of the game on IGN.