Scroll right until you come to the arrow. I find using the shotgun is best here. However, try to avoid the dinosaurs by jumping over them. It's quicker and safer than fighting them. If you use your Uzi, fire in short bursts of three or four bullets. Once inside the building go up the first ladder and right to collect an energy box. Kill the dinosaur at the top of the ladder before getting off the ladder. To the far right of the exit is some ammunition and energy. However, there's a few raptors between you and them. Be careful. Don't try to jump raptors while running up a slope; it will be costly. While on an overhead pipe, shoot below and diagonally down. This is handy for killing dinos before dropping onto a platform. If you are at the edge of a platform and want to see below, crouch down and then push down on the direction pad. After setting off the gas you have to get out of the building quick, you don't really have time to kill any dinos in your way so jump them where possible and don't look back.