Becoming a good sniper is hard. Even those who are very good at it have bad days and sometimes you might even have to change your style but all it takes is practising. Although, here are some tips from personal experiences:
•if you are not very good at sniping dont play maps which have lots of open areas, play maps which have corridors or paths so its easier to hit your enemy. Maps like School or Outdoor pool are very good at this. However dont expose yourself too much because this advantage can also work against you.
•Equip yourself good. You might find some objects might help you to become a better sniper. You have to be fast so id tell you to use the King's crown or the Great Samurais helmet. This will make you go faster and take a better opportunity to hit your enemy. Also try wearing the snipers cape since it makes your reloading faster and increases the damage of your shots.
•Sensibility is key. Sensibility basically means how fast the camera moves when you try to look at something. Good snipers have their sensibility as high as possible because they have to be fast to hit their enemies. This can be graduated when you go to settings. You might feel weird at first but i garantee it will give you more opportunitties to hit your enemies and also to escape from them.
•Fast shotting rate. Its not a secret that sometimes you might see a guy with fancy names and you will see them shotting with their snipers as if they were a rifle or a machine gun. Well it has a trick. There is a way to shot faster which is perfect if you miss one shot with your sniper so dont give up! All you got to do is as soon as you shot change your weapon to the closest cage weapon and then back to the snipers cage weapon and shot again. This might take you lots of practice because sometimes you might not press properlly and will not succeed but you can change the size of all your playing buttons in your settings so I recommend you to make the jumping, shotting, moving and weapons cage as big as possible so you have less chance to fail. (There is also a faster way of shotting but its almost impossible to move while you do this so I wont write it down)
•Upgrade your sniping gun to its maximum level. Obviously this will cause more damage and even if you dont hit your enemies head at least you can leave a big damage ;)
•If you dont feel comfortable with your normal sniper Ill recommend you to use either: Prototype, Dater Hater, Laser Crossbow or Space rifle. All these in their top upgrade level are very powerful, but you also have to take in account the armour strength your enemy is wearing.
•Lastly, if snipping dont get to close to your enemies it might be a bit hard sometimes and you are exposing yourself, use a reasonable distance, not to close or far to achive better results. Also avoid using the "magnifying eye glass" to see your enemies closer, its really pointless unless the person is extremely far away and not moving at all.
•To finish these tips, Ill recommend you to make private servers with your friends and fight 1v1 only using snipers so you can practice and become a pro at it
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Hope my tips helped you ;3