Strike Force Heroes

This one's pretty easy. Make sure to stay near anybody who has low health, because there's a 50% chance they'll be an opponent soon.

This plays out just like a normal level. Keep an eye on who's in the lead with the most kills, or second most if you're winning. I tried to avoid that person. The kevlar vests aren't that significant because of how much damage you should be doing by now, but it is always easier to get a quick kill on someone unarmored. Watch out for kill stealers.

This level is absurdly easy. They don't get a headstart on kills, and your gun is an automatic 1-hit kill.

A tough level if you aren't good at headshots, because most enemies will take 2 hits to kill. On this level it is extremely important not to let others steal your kills. Be prepared to use the thumper to finish off anyone quickly. You should probably avoid tanks because they take a long time to kill. Staying high gives you an advantage.

Practive getting the arcs of your grenades right and you should be fine. Most enemies can be killed by quickly firing off a couple grenades in a row. Keep your launcher well loaded. I didn't use the shield much because I found jumping around to be more useful.

You can easily kill anyone with one hit, and after a few seconds of not being hit you regenerate quickly. It's best to stay high up and sneak down to kill them one at a time, then regenerate.

It's virtually impossible to kills them all quick enough to stop them from massing up. I guess one thing you could do is get your best sidearm, then a melee weapon and try smashing as many as you can before you die, but there is another way. I'm putting this in another spoiler tag because it's AI abuse

The ninjas are almost always totally invisible, except for when hit and I think right before attacking you. The easiest way to deal with them is to get one really high damaging weapon and one high rate of fire one, then jump around spraying bullets until tou see one and finishing it off. They have no headstart in kills, so you just need to kill at least one per life. It gets kind of tedious.

Your biggest enemy here is the poison. If it kills you you get -1 points, which is pretty much the worst way to die. If you're going to die, find somebody else, preferably not your closest competitor for points, and have them kill you. To become the juggernaut, wait until they are nearly dead and finish them off. Then, open fire on anybody near you. You're only getting weaker the longer you wait.

I stayed near the bottom, where I always had a roof over my head, and tried to lure the enemy into the gaps in the roof so that my own helicopter could take them out. The best position is if the enemy is running on the floor above you, so you can run along below them and your helicopter can track them the whole way.

The scientists are very tough. Get the AWP (best sniper rifle) and you can one-shot them, though. Just kill all of them in a row and you have plenty of time to grab the flag. If you don't have it, use the Jackal for 2-shot kills with perfect accuracy, but it'll be a lot tougher.

The enemies are pretty deadly at close range, but they don't seem to notice you often and when they do you can just keep backing up and gun them down. You'll be going through a lot of sniper ammo, so use your sidearm a lot and stick close to the ammo stockpiles.

Play a sniper, wait for someone to be alone, and shoot them before they have a chance to shoot back. You're invisible until you shoot, and enemies will never shoot until they spot you, so take your time and make sure it's safe before each shot.

Everyone loses health equally, so it's not much different from any deathmatch. As with Juggernaut, try not to die from the curse, because that makes you lose a point.

Two extra-tough enemies, one with a Minigun and Blur, the other with a Spas-12 and Iron Will (with cheatingly fast recharge, I think). As with all really tough enemies, the AWP is your friend, although Blur and Iron Will prevent it from being as deadly as usual. Both of them will murder you up close, so keep your distance and use cover. Focus on the guy with the minigun, because he's a bit easier to kill and he does more damage. You just need to kill one of them every life to stay ahead, so it's easier than it looks.

Since the only difference between the classes here is Life, unless you're really high leveled, go as a Tank and restart until the other guy is a Tank too so you both have that extra bit of health.

Use a commando with a rocket launcher (the basic one works) and the Bouncing Betty. Shoot once (or twice if you can), and jump off so they don't get the kill (don't worry, you'll get out of the negative zone soon enough). Drop Betty's when available. You'll rack up the kills in no time.

A slightly easier (it doesn't require a high level) but more time consuming way is to use a Tank with the Reflect killstreak. Camp near your flag and rack up enough kills without dying, and once the killstreak is activated go for the flag. Preferably, get as close as possible before activating it.

I used a Commando (all time favorite), with the infinite clip skill and the Bouncing Betty. If you stay on the planes at the far left and right, you can easily snipe people in the middle without taking too much damage. I placed Bouncing Betty's whenever available, usually next to the points just to make it easier to recapture later. I do believe this level takes quite a bit of luck though.

okay so on campaign you choose the mission siege under and instead of going into the left duct when you start you go to the right there is a black cloud. crouch and go into it. when you get into the room(wait until you get the medal) just click outside the game screen and it should pause. then quit.

Whatever you do, stay at the ground level. As much as possible, stay in the blind spots of the enemy choppers, and wait patiently for your enemy to come by. Your own chopper can then finish them off. Repeat. As long as you stay in the blind spot of choppers, you just need to be patient enough to wait. Also, luck is a factor and you have to pray that your ally isn't one of those stupid ones that will rush out for no reason.