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Step 1
Get the sniper rifle. Stay in the same spot or go to another sniper re-spawn point if you think you'll need more ammo.
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Step 2
Acquire a good, familiar secondary weapon that you are used to. You want something that is good for close to medium range such as a pistol, shotgun, assault rifle or a plasma rifle.
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Step 3
Grab a few grenades. In many cases they're more valuable than a normal weapon. They're good for taking out vehicles (especially warthogs and banshees) and also for stopping intruders in their tracks or killing them by sticking them with plasma grenades. Throwing a fragmentation grenade into an approaching vehicle's path also works very well.
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Step 4
Locate your perfect sniping spot. The spot needs to protect you while giving you enough room to shoot, provide a decent escape route and has to be narrow so you can hit the intruders with grenades easily.
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Step 5
Lure banshees in Halo multi-player into your sniping base by shooting at them with a plasma pistol or a regular pistol so it's powerful enough to pose a threat, but not harmful enough to kill them. Stick them with your plasma grenades when they come close.
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Step 6
Throw a grenade ahead of you if a fast moving vehicle, such as a warthog, comes at you, so the vehicle runs into your grenade, flipping and tossing the rider out with his shields down, a perfect target to kill.
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Step 7
Never stand still, it only makes you a bigger target and an easy kill.
