You do realize that Outskirts is probably one of the easiest missions in the game right? That alley can be skipped so easily...
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I'm against hAX0Rz, bro.
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It's not hacking, especially in the example of Outskirts, where there are numerous easter eggs, 2 skulls, sniper ammo, etc on the roof tops. Bungie did this intentionally. No way they could have hidden so much stuff without expecting people to go there and find it.
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Lots of sections in Halo 2 can be skipped really easily. Just look at Gravemind, 80% of the mission could just be sword flying XD
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That isn't easy though, and it isn't anywhere near 80%. You can skip the outdoor sections, but they are probably the easiest parts of the mission.