If there is a Halo 2 Anniversary, design a skull that you want to be in it
Here are mine
Weapon swap-All covenant spawn with human weapons and humans spawn with covenant weapons
Unpopular-All allies are now against you
Thumbless-Allies spawn without weapons
Discovery-Plasma weapons can now be recharged
Backpack-You can now carry up to four weapons
Doomsday-All enemies spawn with rocket launchers
[Edited on 05.08.2012 8:56 AM PDT]
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But who says new skulls won't be a challenge to get? Maybe some skulls can only be found on LASO Which gives me an idea Supersoldier-Invincible and infinite ammo and grenades. Only found on LASO