Ah sorry my bad.

The last challenge wasn't the hardest for me. I think the hardest was 11 or 13.

Last challenge wasn't as bad as Self-Experiments. God, that was a horribly difficult challenge. With luck and a randomly good gun called the XM29 OICW, I beat these evil scientists.

How do you beat the challenge 8?

when you go to customize your soldier there are colors. i want to be the color i have selected to play in quick match but it will only let me be the blue. is there a way to be the color you selected?

@wolffe23
If you play in teams then you can only be blue and enemies can only be red. If you play not in teams then there will be the color you selected.

oh ok thanks jeff1999

Hey guys! I just beated the 15th challange. Where you ave to fight level 60 tank and level 60 commando with a machine gun. I used my assassin with the strongest sniper weapon (I think it's called AWP) and a blur as a skill. Because here what you need is a very strong one-hit damage. Let's just say high damage low ammo. Because of two reasons:
1) you will die a lot
2) there are two places with those ammo packs
So the fight is in facility and try to go for Justin because he has lower health. If Mike charges at you try to kill him from as long distance as possible so he can't reach you. I didn't use any killstreaks, but a full radar would be nice. Don't use the smoke bomb because it gets you to a random place where there could be one of them. Soo have you got any other questions?

Thanks @jeff1999 Helps alot

For Self-Experiment, use assassin with the smoke bomb. Get two kills, touch the case, use the killstreak and hope you teleport back to your side of the map.

For Angry Golfers, there's a small spot on the left edge of the ship where you can safely shoot them. If you run out of ammo, fall off so they don't get the kill.