Ok, the best selling game series of all time HALO (yay!)!!!! This series has been a blow-out ever since the original Halo:Combat Evolved was released in the '03-'04 area. Its set video game records all over the world. Some include the most preordered game ever (Halo 3 with 1.7 million pre-ordered units) and the most money made in 24 hrs (Prev record: Halo 2 with about $124 million, new record: Halo 3 with $170 million). And with a combined total of about 1.3 billion (yes BILLION with a B) hours played on Xbox Live from Halos 2+3 combined, surely you wont run out of things to do when you've defeated the Covenant!!