Problem: Article: There are several missions available when you play a CoD Ghosts' campaign. However, you don't need to complete all those missions to unlock Extinction mode. All you have to do is to complete the first four missions. The missions that you need to complete are namely Ghost Stories, Brave New World, No Man's Land, and Struck Down. You have to complete these missions on regular difficulty (or higher) to unlock Extinction mode. After completion, you just have to go back to the main menu and you will find that Extinction mode is already available.
Summary: Complete the first four missions. Go back to the Menu.

Problem: Article: Before you start practicing, make sure you have your sheet music, your music stand, your instrument, as well as a timer, a tuner, a metronome, and any other helpful tools you may need. Also keep a pencil, a pencil sharpener, and a clean eraser nearby. By gathering these items before you start working, you'll keep yourself from having to break concentration to find them in the middle of practicing. By designating a certain separate room or area as your practice space, you can eliminate distractions and also prepare yourself mentally for mindful work. Try practicing in a room of your house that people spend less time in, such as the formal dining room. Any area like this will keep you away from distractions such as a conversation between family members in the kitchen or a TV that's on in the living room. It's better to have something to work towards than to just start playing music without intention. Think about what you'd really like to accomplish during each practice session and focus on that goal throughout it. For instance, you might be really close to mastering a piece but still have a couple problem spots. Consider aiming to play the piece through perfectly one time during the practice session. If, for example, you want to improve the sound of your guitar, consider setting a goal to achieve a better sound by experimenting with different hand positionings. If you aren't sure how to set your goals, ask you music teacher what you need to work on at the end of lessons and/or class. Write this down and refer back to it when you practice on your own. The amount you should practice depends on what your skill level is, how old you are, and how dedicated you are to progressing quickly. If you want to advance, you should play your instrument 6 days a week, whether that's for 15 minutes or 2 hours each day. Pick consistent times and days that work best for you and always practice when you're scheduled to. If you want to practice for 6 hours a week, you might schedule practice time from 3:00pm to 4:00pm every Sunday-Friday.
Summary:
Gather your tools and materials. Pick somewhere quiet to practice. Set a goal. Create a practice schedule and stick to it.