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The first Halo game, Halo: Combat Evolved or Halo: CE is about 600MB.
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There are currently seven (7) Halo Series Video Games: Halo: Combat Evolved, Halo 2, Halo 3, Halo Wars, Halo 3: ODST, Halo: Reach, and Halo: Combat Evolved 10th Anniversary Edition. The release of Halo 4 from 343 Industries will increase the total to eight (8).
Currently 5 with an upcoming 6th in late 2010 Halo: Combat Evolved Halo 2 Halo 3 Halo Wars Halo 3 ODST Halo Reach
As of the time of typing the Halo series has had the following games Halo: Combat Evolved Halo 2 Halo 3 Halo Wars Halo 3 ODST Halo Reach Halo 4
Up to two players can play in the Co-Op Campaign mode on Halo: Combat Evolved.
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There are 10 levels on halo combat evolved. 1. the pillar of autum 2. halo 3. the truth and reconciliation 4. the silent cartographer 5. assult on the control room 6. 343 guilty spark 7. the library 8. two betrayals 9. keyes 10. the maw
Many Halo's have been released for the Xbox. (list of Halo games, in order of release date) Original Xbox: Halo Combat Evolved (November 15, 2001) Halo 2 (November 09, 2004) Xbox360: Halo 3 (September 25, 2007) Halo Wars (March 03, 2009) Halo 3 ODST (September 22, 2009) Halo Reach (September 14, 2010) Halo Combat Evolved Anniversary Edition (November 15, 2011) Halo 4 (Coming Soon)
Well, as of now, there are currently three main Halo Games. Halo Combat Evolved. Halo 2. Halo 3. There are three spin-offs. Halo Wars. Halo 3: ODST Halo Reach And of course, you've got Halo 4 due for a release soon.