NextGen Player writes:
"For long-time Xbox 360 FPS fans you'll immediately draw a parallel to Call of Duty: World at War's Nazi Zombie mode or Gears of War 2 Horde Mode. In my opinion, Firefight mode is even more addicting and provides thrill-a-minute action with varying wave-after-wave of relentless Covenant forces. The AI of the Covenant has been tweaked upward and they will now seek to rout you out with much more aggression than in the campaign. What's more, as you progress further into the match, difficulty-multiplying skulls get triggered on, making survival increasingly unlikely. If you can manage to survive for an hour or longer you'll have so many skulls active that your enemies will easily bulldoze you if make one wrong turn."