Halo Reach is based off the 2001 novel 'Halo: The Fall of Reach'. It features you as Noble Six in which you are part of a squadron of Spartans defending Reach from the Covenant. There are many things to know about this game. For starters, you cannot dual wield weapons. Yea, I know this is a drag for most who like putting combinations of weapons together and doing the ol' Mauler/SMG combo. Spartan Armour can be customised by going to the armory, in which you gain pieces to buy by ranking up in the game. Elite armour is customizable only by templates which again are gained by ranking. Spending 'Cr' to buy armour will change how your spartan looks while you're doing the campaign or firefight modes. You'll also start out with all the skulls so you can play the campaign however you want. There's many goodies in this game such as new weapons and vehicles so let me share them with you. *WARNING: Contains Spoilers.*
New Weapons:
Spoiler: DMR, Grenade launcher, Artillery Strike Target designator, Needler Rifle, Focus Rifle, Plasma Launcher, Concussion Rifle, Plasma Repeater. Some of the weapons have been replaced or improved with these weapons above.
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New Vehicles:
Spoiler: Revenant, Falcon troop transport, Warthog with Rocket Pods. Some vehicles are not in Reach such as the Trans Warthog, and the Brute's vehicles.
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New Units:
Spoiler: Skirmishers, just about as fast as Jackals but more deadly and annoying. Avengers which are from Halo: ODST give the Covenant in the immediate area extra shields.
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Game modes include Campaign, Matchmaking, Firefight, Forge, Custom Games, and Halo Waypoint, which is how you can unlock new armor that can't be unlocked by rank or Cr. Firefight mode is now completely customizable as well.
The game's full of fresh new stuff and is real fun, so definitely try it.