Continue down the ramp and drop into the room below. Push the farthest crate to the right and you will come across a pressure switch which will invert gravity on the left hand side of the room. Ignore this for now and push the box up the slope on the right side of the room. When the gravity is back to normal, give the box one more push, then run and jump over the button. Run up to the second crate, push it a little and then jump back up to the slope above. Wait for gravity to right itself again and grab the crate before it slides down the ramp again and place it beneath the ladder at the top.
Jump up the ladder and continue to the right a little bit. Climb down a second ladder here. This will extend down into the pressure pad room below. Climb down the ladder. Once again, push the crate up the slope, and as it makes its way towards the button, run back to the ladder, climb to the top and head to the left, by the time you reach the end, the gravity should have been altered and you will see the other box hanging just off the edge of the platform. Pull it onto the main platform.
When gravity corrects itself, push the crate so it sits just below the upper platform on the right side. One final time, climb back down the ladder and push the crate up the ramp again. Quickly climb the ladder and jump onto of the crate. As gravity goes nuts, jump across to the now open platform above.
Continue to the right. You will see an elevator here.
Achievement/Trophy: Run up to the elevator and press down. You will climb down the edge. Jump to the chain here and climb all the way to the bottom to find an egg. Step on it for the achievement/trophy - Under GroundĀ.
Press the button to lower the elevator. Once the elevator is at its lowest point, hit the switch again ad jump onto the elevator to be lifted up to the higher platform. Hit the switch here to lower it again, then hit it a second time and jump on top to ride it up. When you reach the highest point, you will need to jump off immediately as you will be in a horizontal turrets laser sight.
The turret will break the rope holding the crate nearby and it will fall to the ground. Lower the elevator again and push the crate on top. Raise the elevator again and jump on top, standing behind the crate for safety. At the top, hop on the crate and then jump to the platform above the turret. In here you will find another gravity switch. If you turn it off, you will see a crate drop down, wait until it is moving down the slope to the right and turn the switch on and off continually until you can bring the box out of the area. Try to not let the box hit anything as this will change the direction in which it moves. Once the box is out, push it as far as possible to the right.
Jump back down to the upper platform below and lower the lift. Jump over the crate and push it to the right, there is another horizontal gun in the far right of the area and you can use the crate as cover. From the crate, climb the ladder. At the top, hit the switch to invert gravity. Jump over the box and runto the left to find the second box you liberated earlier. Push it back to the right so you now have two boxes to play with.
You should see a section of wall that moves in and out from the right hand side, we will need to utilise this to continue. Place one crate closest to the platform from which the moving wall comes out. Place the second crate further away. Run back to the switch and when the wall is below the first crate, activate the gravity reversal. The wall should have the first crate on it and should be pushing the second crate along the floor. Quickly jump up onto the second crate, then onto the moving platform, and then up again onto the first crate. From here you can jump up to the ledge on the right.
Climb down the ladder to continue.
