LV1: Near the start of the secret area, find it on a dumpster.

LV3: After throwing the cubes in the bucket to lower the platform, cross the new platform and shoot the trash to the left. Grab the vial in the trash and use it on a vending machine nearby. Carry 3 cubes up the ramp to the left, throw the cubes in the pail. Lastly, follow the new platform down to find the Echo.

LV4: In the long winding path with several scattered volatile barrels, find a Pylon that can be charged to activate a wall right next to same Pylon. Find the suitcase at the top.

LV5: After opening the first door, enter it and go left. There is a lift at back of the next room. Ride the lift up until in reaches the top. Go right a little bit to find the suitcase.

LV7: There will be a split in the road near the hill. The Echo is located on the right side of this split.

LV8: When the humans are falling, power up the Vending Station and use charge cubes to activate the two power Pylons. The radio will be turned off to the right. Follow the newly raised path.