I'm not aware of the exact number but I know that more than five million copies were sold worldwide.
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halo has had 6 games released as of Sept 2010. halo 1, halo 2, halo3, halo3 odst, halo wars (which is not like the other halo games) and halo reach. in the us there has been over 500 million copies of halo sold and a Gross income of over 50 billion dollars
Wii Sports, with 61 million copies sold. For games not bundled with the console, I believe Nintendogs on DS is #1.
There are 10 levels
10 levels
Yes.it's based during halo 1 so is halo wars.( but that wasn't really a halo game)