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Halo: Combat Evolved
Halo: Combat Evolved is a First Person Shooter released in November of 2001 by Bungie Software for the Microsoft Xbox. The series continued with Halo 2 and soon to be future Halo 3.
Speed Runs
The Speed Demos Archive hosts Halo competition. Halo runners compete on a variety of different levels and difficulties; the current combined time for Legendary on Single Player is around 1 hour, 35 minutes, and 57 seconds.
Speed Run Strategies
General Tricks
Backpack Reloading
When you have to (or want to) reload your gun, press X, X, then Y (or equivalent). This will result in you being able to switch weapons, but your gun will still reload. This lets you fire your other weapon while the other one is reloading in your pocket.
Grenade/Rocket jumping
Simply throw a grenade on the ground, stand over it, and jump when it explodes and it will propel you higher than a normal jump. Very useful for getting to high places. Rocket jumping works the same way and gets you higher than just a grenade, but you need to put more distance between you and the explosion (by jumping off a small ledge or something) because it does more damage.
Double Melee
Simply press melee, grenade, and melee in rapid succession. This will allow you to punch twice in a row incredibly fast; very useful for situations in which you need to dish out a lot of damage in a short amount of time. The one drawback to this trick is that you end up throwing a grenade, so make sure you run out of there quickly.