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Some weeks are more difficult than others. Tony does this to appeal to players at different levels. If, as a beginner, you find a week is beyond your skills, like others have said do your best, give it your ten minutes and then hit complete and dont stress. Then spend at least another ten minutes practicing something else that you have learned and feel more comfortable with. Chances are the next weeks challenges will be easier. Remember learning to play guitar is hard. It takes committment and time, and like @Bayvu2 said you get out of it what you put in. If your goal is to progress more quickly, you have to play more. The more you play, the better you get. Keep at it bro and enjoy the ride.