Gameplay: 

The Master Chief Collection originally consisted of Halo: Combat Evolved Anniversary, Halo 2 Anniversary, Halo 3, and Halo 4, complete with their full catalog of extras, including all multiplayer maps and gameplay modes. There have been no story or gameplay changes to the original releases. The games are first-person shooters with vehicular combat that takes place from a third-person perspective. Each campaign has four difficulty levels and access to gameplay modifiers known as "Skulls".