Skulls:Unlock the following skulls at the specified locations by performing the corresponding tasks:Look Daddy! – Kill 100 Grunts. In Mission 1 (Alpha Base), the Skull is located on the left side of the last battle area before you go into Alpha Base. When Grunts die, their methane tank will always shoot off.Grunt Birthday Party – Kill 20 Jackals. In Mission 2 (Relic Approach), the Skull is located on the south edge of Alpha Base, just inside the walls of the base. Grunts explode into confetti when killed.Cowbell – Kill 45 Hunters. In Mission 3 (Relic Interior), the Skull is located at the very back in a circular platform where you have to save Forge/Anders. Destruction physics are increased.Wuv Woo – Kill 50 Elites. In Mission 4 (Arcadia City), the Skull is located on the right side of the map just below the Covenant base. It is just past the top of the stairs. Scarabs shoot rainbows.Fog – Kill 5 Wraiths. In Mission 5 (Arcadia Outskirts), the Skull is located on the left side of the map, at the top left corner. The mini-map is disabled, and your final score will increase.Sickness – Kill 50 Banshees. In Mission 6 (Dome Of Light), the Skull is located just inside the big hangar behind your base. All player units have 50% fewer hit points, and your final score will increase.Rebel Sympathizer – Kill 10 Locusts. In Mission 7 (Scarab), the Skull is located on the left side of the map at the very edge of the battlefield area. There is a ledge that projects over the canyon, next to a Power Node. Non-player units get 25% more hit points, and your final score will increase.Rebel Supporter – Kill 750 Infection Forms. In Mission 8 (Anders