Halo is much more than just a game. The series is a cultural touchstone that has become a pillar in the shooter genre. So in honor of the 15th anniversary of Halo 3 this month, I wanted to focus on one of the most influential shooters of all time. These are ten things you never knew about Halo 3. Halo is much more than just a game. The series is a cultural touchstone that has become a pillar in the shooter genre. So in honor of the 15th anniversary of Halo 3 this month, I wanted to focus on one of the most influential shooters of all time. These are ten things you never knew about Halo 3.