at first you have to put your guns aside and grab your shovel, then you have to start looking for crystals of the color you need. After finding some make sure you aren't an easy target and go to town on them. Having crystals does not only mean you'll have more ammo, you can also buy useful equipment with them. After gearing up you are ready to get to the top of the list. If you want even better equipment or ammunition... you know what to do :)
