By earning achievements.
Grunts (Uggnoy) have masks because the only air they can breathe is methane. The masks supply them with it.
they live
Everytime they make a new album they change masks.
Yes. Halo ODST is the new Halo game.
chances are no their will not be a new halo after reach
halo reach is the last halo for good
papa new guiney make masks because they whant to
yes halo universre
There are several company's selling and inventing new gas masks.
New Halo.
* there is no halo 4
Halo: Combat Evolved was the first Halo game made. The new Halo Wars is a prequel of Halo 1.