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Campaign:
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In campaign mode, you start off as Master Chief, a government super soldier (post-human) and part of the UNSC's (United Nations Space Command) "Spartan project". A series of experimental... well, experiments - to physically and mentally upgrade children from a young age in order for them to fight in a war against the Covenant, an army of Aliens formed from Grunts - the weaker aliens, Jackals - the deceiving snipers and 'ninjas' of the pact, and Brutes - Huge, bear like monsters who often lead packs of grunts, or in some cases, other Brutes. The covenant are led by worm creatures, or "prophets" and in Halo 3, you are up against the Prophet of Truth - who plans to activate a series of "Halo rings" which have the power to destroy entire planets. So the concept of saving the earth is used a lot as a storyline, the point is that it's played out really well and to a fine touch in Halo, where you are always pushing and moving forward.
Okay, now I've fed you the back-story, I will discuss the actual game play of the game... the controls work like a charm, the movement is swift, and due to fantastic world sculpting and geometry of the surrounding areas, you are not glitching about, unlike many other first person games.
There isn't a huge amount of variety as weapons go, but easily enough for what you need, ranging from a pistol, to a full-on assault rifle, and the designs go from outrageous (for instance the "needler" pictured below) to incredibly sleek (for instance the smooth "beam rifle" or covenant sniper).
Needle a helping hand?
There is a large selection of vehicles as well, the warthog is a large buggy - type vehicle with a turret attached to the back, there are people carriers, mini-warthogs, "ghosts" (a small, one person land-ship with plasma cannons attached to the front) and various flying machines such as the "Hornet".
You'll have a "ghost"... of a time!
The campaign will at one time, will either be epic, or incredibly fun; At one point, there is a tremendously large air-battle which my friend joined in with (Oh yeah, there's co-op) in which I kept jumping ships and kicking the covenant ship-riders into the ocean below, until all ships were destroyed and I could land safely on the ground. It's frankly, one of my best experiences with ANY game, due to the fun and sleekness of how it was pulled off.
Another point of, not only the campaign - but the entire game - is the visuals; from explosions, to the surrounding world, to the Master Chief's armour - are brilliant. Oh! And this is one of the few games where the terrain is smooth and NOT BUMPY!
If you get this game, I can guarantee straight up - you WILL enjoy the campaign... if not anything else.