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It's sold 6,443,550 copies after 6 weeks on sale.

It outperformed my prediction for this week by a whopping 128k!

It's outsold my predicted sales every week except week 1.

It took Halo 3 13 weeks to sell as much as Halo 4 has in 6. It took Halo: Reach 14 weeks to sell what Halo 4 has in 6.