You know that boosting method on REACH on Score attack? When you get a challenge pull the ehternet cable out? Yea well here you go. Do the challenge ONE SPARTAN ARMY on Score Attack. When you get up to 399-400 leave the game.And start it up again and get one kill on GruntApocalypse and pull your ethernet cable out and put it back in and sign in. Get another kill and you should get the challenge again! Do it over and over. I got 35536CR in 10min!