More:Halo: Missions: Sidewinder

From GameWinners

Contents 1 Get above the map 2 Sniping position

Get above the map

You can get above the map, allowing you to get around extremely quickly and can barely be seen by others. Put a tank near the teleporter area that you get to from the Blue Base teleporter. Then, get in a Ghost and ramp off the tank. You will be above the map.

 Xbox  Take a Ghost to the cliff that the warp in the Blue Base leads to. Get some speed and ride the Ghost sideways toward the mountain wall. Press X to exit the ghost a short distance before you reach the wall then press A to jump. The Ghost should push you up on top of the level.

Create a game with 400% shields and only rockets in multi-player mode. Then, go to the Blue Base and climb the ladder. Get full ammo and walk to the edge. Look directly down and keep walking until your pointer is about to go off the edge. Then, jump up and fire. Move backwards in midair, and you should be on top of the Blue Base, but not quite on top of Sidewinder. Repeat the same steps until you are up on top. The only way to make a kill on top is to stand at the edge. A good way to tell if you are about to fall of is to throw plasma grenades just in front of you while walking towards the edge. If the grenade floats in the air, you are safe. However, if it falls to the ground below, beware of falling.

Put a Scorpion tank on the cliff. Put it beside the second door on the cliff near the Red base. Line it up sideways, then get a Ghost and ramp off the tank towards the wall. If done correctly, you should get to a white area. Get close enough to the ledge and you can snipe people.
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Sniping position

Take a Scorpion near a red or blue base. Jump on the Scorpion, and you will be able to jump on a ledge beneath the top floor. When your opponents try to go into the fort, shoot their heads off. This is a good way to get extra kills.