Hi. You already know about the new custom challenges that 343 made. So I gave this a test and found that it works really well. I made a video here that shows how it works exactly. I also have another part here that shows you how you can use it to your benefit.
Yet again, I know most of you know that there is custom challenges out, some people that do not come on the forums do not. So tell your friends that this is how you can do it.