The ESRB have rated Halo: Combat Evolved Anniversary.

A slightly strange sight to see, the HD remake gets a firm “M” for mature and details what we all kinda’ know already; aliens, sniper rifles, rocket launchers, grenades and good old “cries of pan”. It reads like a fairytale as we relive, once again, one of the greatest games of all time:

This is an enhanced remake of the 2001 first-person shooter Halo: Combat Evolved. Players assume the role of Master Chief, a super-soldier who engages in futuristic battles against a powerful alien alliance. Players use plasma pistols, sniper rifles, machine guns, and rocket launchers to kill enemy creatures in frenetic combat. Firefights are accompanied by realistic gunfire, large explosions, and cries of pain. Frequent blood-splatter effects occur when enemies are shot, sometimes staining the surrounding environment; aliens often break into bloody fragments when killed.