all you have to do is go to halowaypoint.com and once there sign into your live account and then look on the banner on the top of the screen for the challenge section. Then after you clicked on the challenge page it shud bring you to a screen with the daily challenges and weekly challenge for the day, scroll down a little and click on create a challenge give it a name. for my custom challenges i usually start out by doing 4 challenges and all in the campain. for each challenge, 1= 600medals=5000cr, 2=175grunthero=5000cr, 3=300jackal specialist, 4=175skirmisher specialist. set the time for each challenge to 3 hours for completion but it only takes about 15min for all challenges. I suggest doing in this order all the challenges will be on oni sword base on heroic all skulls on except blind and iron, make sure you have a save on the profile you made the challenges for that meet all the requirments that you set up for your custom challenge it wont work if the skulls and difficulty arent the same as the challenge one. now for the work part of the challenge make a save with all the setting on the challenges on oni sword base and make sure to run all the way to the target desegnator right as the gamae starts and dont kill anything pick it up and make sure you get a checkpoint before you start killing once you got the checkpoint start killing use on strike get all the kill you can with one shot and then revert to last save. just keep reapeting for about 14min depending on how good your save is once you do them revert to last save and then save and quit wait for it to load once your in the lobby head back over to your computer or what ever you used waypoint on and click on each challenge and make sure they are completed if not go back and finish them, turn each challenge in. then once theyre all turnd in start up a forge game and end it and you should get 20,000cr in about 17min tops, once the game end(note:doesnt have to be a forge game just any game that gives a cr loading screen at the end) it wont come up as the number of cr you got but your xp bar will go up and so will your cr. (note:you dont have to do the challenge i gave it was an example but i find it to work the best xp per hour) NOTE!: do not do more then 100,000cr in one dday im not fully sure if youll get banned or not if you surpas that limit so just stay under 100,000cr a day or if you dont care about the possibility of getting banned then do what ever you want.

1.) Go here [ Register or Signin to view external links. ]
2.) sign in to your xbox live account
3.) scroll over your gamertag once it shows up. (a section of boxes will appear underneath it.)
4.) scroll over the boxes until you get to custom challenges all the way on the left.
5.) the rest is self explanatory.

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Change The Custom Challenge to 400 Headshots For Firefight Matchmaking and Play "Score Attack" and Vote For "Gruntapocalypse" amd Keep Doing That And You'll Rank Up Fast.

I thought these were just to compete with friends?