While most people will undoubtedly use this difficulty level exclusively for co-operative play, there will always be those friendless or masochistic few who intend to beat it solo - like adding a fourth notch to their Halo Bedpost after a rough night on the town. And so for those brave few good men and women of the UNSC, I present the New Mombassa Survival Guide.
If at first you don't succeed...
Try, try, try, try, try again. Defeat is an unavoidable part of your romp through Legendary mode, and it comes in many forms. Sometimes it's a stray grenade, sometimes it's a lucky Carbine shot to the head, but whatever it is that puts you down you just need to pick yourself back up and try again.
Move, move, move!
One of the most important survival tips I can give is to just stay moving. For the most part, Covenant weaponry uses slower moving ammunition than good old fashioned hot lead, and it's harder for a Jackal sniper to hit you between the eyes if you don't stand in one place.
Those who fight and run away...
You're always outnumbered and you're always outgunned, but sometimes you're more outnumbered and more outgunned than others. If you're not packing enough heat to deal with a pack of enemies, try going a different way. If you run out of options in the midst of a conflict, there's no shame in retreating to better equip yourself.
Beggars can't be choosers.
Running low on ammo? Don't hold out for more of the same kind, throw it down at the first opportunity you get to replace it with something else viable. While you may not particularly enjoy carrying around a Needler or a Plasma Rifle, it beats running into a party of Brutes with one clip in your SMG.
Smash and Grab.
Hunt down the audio logs so that you can unlock the UNSC Weapons Caches around the city. These are the only way to reliably get more ammo for your Auto-Mag and SMG, as well as stocking up on Frag grenades. Some of the caches even have more heavy weapons in them, such as sniper rifles or rocket launchers. Occasionally you may even find a Mongoose to make life that much easier for getting from point A to point B.
And carry a big gun. You'll thank me when you run into a Brute Chieftain or a pack of Hunters.
The old one-two.
While it may not feel like the most devastating set of weapons, in the absence of heavy firepower, the best combination is a Plasma Pistol and the AutoMag. Single bullet to the head kills Grunts. Hitting a Jackal once through the gap on the side of their shield causes them to flinch, exposing themselves and allowing you to once again plant a single bullet in their skull. A charged Plasma shot will drop the shields and destroy the armour of a Brute, allowing for another single shot kill. While you may feel more comfortable with an automatic weapon, spraying your load all over the wall beside your target, precision pays.
While it may be tempting to throw a grenade into a crowd of Grunts, don't. Conserve these for when you really need them, particularly sticky, fire and spike grenades. If you're in a tight spot, tagging a brute that's gotten close enough with one of those can level the playing field pretty quickly, but you're going to need all you can get your hands on to take down a pair of Hunters if you run into them with no means of escape and no heavy weaponry. While it's undeniably fun to needlessly tag an enemy with one of these, try and keep them for "emergencies".
And ultimately that's about all you need to know when it comes to surviving the mean streets of New Mombassa. Good luck out there, and try to make some friends before Halo: Reach comes out.