Before Plants vs. Zombies, the idea of plants fighting zombies was merely a passing fancy in the heads of society’s craziest castaways—and the game’s crazy-like-a-fox developers, of course. The concept: a slow-marching army of zombies is advancing on your house; you plant shrubbery capable of shooting various projectiles at said zombies.
That, for 50 levels—yet it never seems to get old.
iTunes Link: Plants vs. Zombies
See also: Bejeweled 2 + Blitz