In NFL Challenge play one of the "gold metal" challenges. The best one for this is the "Coming Through" challenge. This calls for 1-3 sacks in one drive. If you get 1 sack you get 1,105 development points, 2 sacks get you 1,233 development points, and 3 sacks get you 1,360. This challenge takes five days. If you get the gold it congradulates you, saves, and marks the challenge as done. If you get the silver or bronze it asks if you want to try again or exit. If you choose exit it just gives you the corresponding points. If you choose trr again it restarts the challenge, but for some reason keeps the points. If you choose exit you will not be able to return to this challenge. If you keep getting silver or bronze (each time takes about a minute) you will keep getting more and more development points. You can do this as many times as you want just don't get gold or you will not be able to do it again. The best thing is that if you press try again it doesn't cost any extra days.