Halo 3/Maps

Construct

 * Description: Vast quantities of water and other raw materials are consumed in creating even the smallest orbital installations.
 * Recommended Players: 2-8 Players.
 * Tactics: A medium sized map featuring big gravity lifts and Support weapons like missile pods and flamethrowers, this is the only map that you can earn the incineration medal. Scoped Rifles are highly recommended to combat anyone with a energy sword. There is a Spartan Laser here but it is not really recommended but just might be useful.
 * Recommended Game Types: Slayer and Oddball.

Epitaph

 * Description: Some believe the Forerunners preferred desolate places. Others suggest that few other sites survived the Flood.
 * Recommended Players: 2-6 Players.
 * Tactics: The map is moderately large with gravity lifts and both the Active Camo and Overshield power-up. Most kills are done on the first floor right in the centre or in the rooms on either side. Using the columns as cover will help you survive fire but enemies may come and melee you if they are close enough. The top levels are for people with battle rifles or any other scoped rifle.
 * Recommended Game Types: Slayer and King of the Hill.

Guardian

 * Description: Millennia of tending has produced trees as ancient as the Forerunner structures they have grown around.
 * Recommended Players: 2-6 Players.
 * Tactics: Using shotguns and melee is essential in this tiny map. Needlers work too, but not as effective. Active Camo is worth gold here as assassination equals killing spree. But note that the radar is not effective even though this is a small map as the two floors are almost exactly aligned.
 * Recommended Game Types: Slayer and Oddball.

High Ground

 * Description: A relic of older conflicts, this base was reactivated after the New Mombasa Slipspace Event.
 * Recommended Players:N/A
 * Tactics: This medium-sized map is divided to two halves: The Base and the small Gorge. The nature for this map is for teams to unintentionally switch sides of the map as they are attacking each other.

The base itself has two maulers and some carbines, needlers and one spartan laser. The base has a gate and a computer linked to open it. (Note that the gate cannot be closed and is usually guarded so that the opposing team doesn’t open it, but usually the gate will be open within the first minute.) The base itself is not perfect. There are breaches here and there, including a breach in a bunker linked to the base. Each side has at least a Ghost and a Mongoose (Although the base has two Mongooses).


 * Recommended Game Type: Slayer, One-sided Assault and One Flag.

Isolation

 * Description: Containment Protocols are almost impervious to pre-Gravemind infestations. What could possibly go wrong?
 * Recommended Players: 2-10 Players
 * Tactics: There is only two tactics that will own here. One: Get the rocket launcher and go GET ON THE GHOST. By taking the rocket launcher you prevent someone else the chance of blowing up the ghost. Then proceed to splatter everyone that you can and shoot plasma at those who you can't. Two: Get a sniper rifle and at least a mauler or a shotgun and stay on the highest platform you can find and snipe down your enemies. Note that the bulging lumps that spurt the Flood out in the campaign will NOT do so here. (So don't waste your ammo in the hopes that you will release the flood again.)
 * Recommended Game Types: King of the Hill, Slayer and Oddball

Last Resort

 * Description:Remote industrial sites like this one are routinely requisitioned and razed as part of Spartan training exercises.
 * Recommended Players: 4-12 Players
 * Tactics: This map is actually the map Zanibar from Halo 2, redesigned and refitted appropriately for Halo 3. If you notice, there are lots of Fusion Coils around the map (30+) and could be used to your advantage. (i.e Shooting the ones near your enemies so they explode like frags, doing more damage than the few bullets you used to set it off.) Snipers are ultimate here, and with a shotgun in hand to kill close range, it will be easy to get killing sprees. Vehicles are also power houses. Surprising as there is little space to drive here.
 * Recommended Game Types: Slayer, Assault, Capture the Flag and ESPEACIALLY Shotty Snipers.

Sandtrap
Note that if you go too far out brute trip mines will pop out and kill you. (The only vehicles fast enough to avoid it are the mongoose, warthog and the ghost)
 * Description: Although the Brute occupiers have been driven from this ancient structure, they left plenty to remember them by.
 * Recommended Players: 6-16 Players.
 * Tactics: One of the largest maps in Halo 3, Sandtrap displays a vehicle exclusive to itself: the Elephant. The Elephant is the largest, heaviest and slowest vehicle is the game. Some people guard the Elephant with the two turrets on it while one drives. The Elephant itself is invulnerable. It is also able to hold other vehicles. For these reasons, it is often used as a mobile base. Other than that the banshee is the owning vehicle here. It spawns near the crashed phantom. Sniper rifles are not really good as there are lots of places for people to hide in. Shotguns and such are not as effective because there are few small and enclosed spaces.
 * Recommended Game Types: All types of Big Team Games.

Snowbound

 * Description: Hostile conditions did not prevent the Covenant from seeking salvage on this buried Forerunner construct.
 * Recommended Players: 2-8 Players
 * Tactics: As I said in Isolation, the first tactic is to get a Ghost, but this time there is no rocket to worry about, only a spartan laser that almost NO ONE takes. but seriously, if you are an amateur or a professional, you'll know that ghosts won't make the cut as almost every kill is done below ground, close range. So get a mauler (2 is fine)or if you can, you will DEFINITELY want a shotgun. Like Sandtrap, if you go too far out, instead of mines, giant plasma turrets start shooting you.
 * Recommended Game Types: Slayer

The Pit

 * Description: Software simulations are held in contempt by the veteran instructors who run these training facilities.
 * Recommended Players: 4-10 Players
 * Tactics: This Map is pretty simple to describe tactics as both sides of the map are EXCACTLY the same. On each side there are two maulers, a sniper rifle, a shotgun, a battle rifle and a needler. In the center of the map there is an active camo, an overshield, a rocket launcher and an energy sword. Each base has a turret facing each other. This is a medium-small map that if you manage to balance short range and far range, you will get as much as a killing frenzy. In fact, this map is best for getting shotgun, sniper and sword spree medals.
 * Recommended Game Types:Capture the Flag, Assault, Slayer and Shotty Snipers

Valhalla

 * Description: The crew of V-398 barely survived their unplanned landing in this gorge... this curious gorge.
 * Recommended Players: 6-16 Players
 * Tactics: This Map is where the spirit of Coagulation lives in Halo 3. There are two man-cannons in each base, the central one leading close to the center of the map, which the Spartan Laser resides and the side man-cannon leading to a sniper spot that almost no one uses as it is too well known that the snipers there have an average life of less than 30 seconds. The base that is near the sea is slightly further away from the Spartan Laser than the other base, resulting it in the 'land' base always gettng the Spartan Laser first. So the 'sea' base has to turn to sniping the 'land' team. Note that the turret in the middle is hardly used. Also that the bases both have 2 mongooses and one warthog. There is also a mongoose near the middle turret.
 * Recommended Game Types:Capture the Flag, Assault, Slayer and Big Team Slayer

Heroic Map Pack
The Heroic Map Pack is the first map pack available for download on the Xbox Live Marketplace. As of March 24th 2008, the map pack can be bought for free.

Standoff
The symmetrical valley of Standoff, with its entrenched bases and fields of boulders is ideal for mid-sized objective and Slayer game types.

Rat's Nest
The vast, labyrinthine passages of the Rat's Nest brings something completely new to the multiplayer experience: an indoor vehicle paradise. Strongly influenced by the Campaign mode, this map is ideal for big team battles.

Foundry
Foundry is the ultimate Forge map. Players can edit every single object in this voluminous industrial warehouse, placing stairways, walls, bridges, and tunnels to create an entirely new play space and build almost any kind of map imaginable. Also available to the map are the new Mancannons (Large Gravity Lifts), Soccer Balls and other new items.

Legendary Map Pack
The Legendary Map Pack is the second map pack to be available for download over Xbox Live from the Marketplace. It was released April 15th 2008 and costs 800ms. It contains the maps Ghost Town, Blackout, and Avalanche.

Ghost Town
Ghost Town is an asymmetrical map that has influences from Warlock and Isolation. It is a medium sized map, but is also very confusing to navigate.

Blackout
Blackout is a remake of Halo 2 map, Lockout. It is a small map used mainly for slayer. All things remain the same in Blackout as they did for Lockout, except for the base being a UNSC base, no window in the middle, and the Sniper tower room is now bigger.

Avalanche
Avalanche is a remake of Halo: Combat Evolved map, Sidewinder. This is a very large map, best used for big team battles and objective gametypes. The changes between this and Sidewinder are that there are no more ladders, the tunnels have been changed, the Warthogs no longer slide on ice, and there are man cannons. Also, as an added bonus, the UNSC vehicles now have snow paint jobs.