More:Halo 2: Missions: Quarantine Zone

From GameWinners

Contents 1 Sputnik Skull 2 Faster level completion 3 Sniping location

Sputnik Skull

Play Quarantine Zone under the legendary difficulty setting. At the start, turn left immediately. You should see an Elite, and just slightly to the left of him should be a cave. When you reach the exit to the cave, there should be a cliff. Follow the cliff to a wall. Along the wall should be a small walkway. Go on the walkway. At the end of the walkway should be a skull. The world "Sputnik" will appear when it is picked up. Explosion and melee forces are greater in this mode.

Faster level completion

At the start of the level, there will be two Ghosts and a Spectre. Take the Ghost and defeat the Sentinels. Then, go through the level, taking out the big machines that can grab your Ghost. You can keep going until you reach the canyon where the Flood in Wraiths and on ground are fighting the big machines. If you grab a rocket launcher in the earlier part of the level by the Warthog in the center of the first major fire fight, this should be easy. Take out the Flood with the rocket launchers and continue on once they are dead. Speed on until you reach the ship ruins. You can actually take a Ghost in the narrow path and keep speeding. although it will get tight in the room with Sentinels and Flood. Head outside and speed to the right. Take heed of the Covenant Flood with the rocket launcher. Once you enter the last room you must get off the Ghost. The Flood will notice you -- activate your camouflage. From there on, pass on through the boxes and make a left to the Ghost. Keep your rocket and sword ready and get on the Ghost. When you go to the final canyon, head to the farther end. Drive the Spectre, and speed on. Head for the middle passage once you get to the gateway to the Library's gondola, and make sure you are going fast enough. The Flood may come out with assault weapons and even rockets.
ovb, geuaa

Sniping location

At the point you go on foot, there will be cliff side with a ruin on it. The should be a channel on the cliff face with no ruin blocking it. Use a Ghost to get up the cliff using the boost. When at the top, there will be a vast frozen plain. This is a good sniping position. You will need the Ghost as it is a big plain. Note: Do not fall in some places, as you might get trapped or just fall to your death.