Halo 3 has sold fewer than 10 million copies by January 3 , 2008 .
As of January 3 , 2008 , Halo 3 has sold 8.1 million copies , and was the best-selling video game of 2007 in the U.S . Overall , the game was very well-received by critics , with the Forge and multiplayer offerings singled out as strong features .
Halo 3