Snowbound

Snowbound is a multiplayer map in Halo 3. It is a winter-themed level with large Covenant bases. There are also bunkers protected by energy shields that stop all weapons, but let players pass through. Although, Spike Grenades can stick to the shield itself. It could be a new version of the Halo 2 map, Containment.
 * Weapons: Shotgun, some sort of Sniper, Assault Rifle, Battle Rifle, Automatic Gun Turrets.
 * Vehicles: Ghost.
 * Size and shape: Smaller and more symmetrical.