Hidden Spider 49 — You can find the 1st one on the roof of one of the police cars floating to your left right when you begin this level. You can just web-zip onto the police car to grab it.
Hidden Spider 50 — You can find the 2nd one in the first building hallway you enter right from where you began this level. It will be inside the ventilation system down the hallway to the left and up the wall of it. It is also right in front of the acid eggs.
Hidden Spider 51 — You can find the 3rd one inside a ventilation unit at the lowest level in the first big area that you enter after going through the hallway of the building you just entered. It will be underneath the number 3 gate platform. This is the same area where you will need to save the 2 scientists. You will need to throw an acid egg at the fan in order to be able to jump web-zip into it.
Hidden Spider 52 — You can find the 4th one near where you found Hidden Spider #3. But instead of it being below level 3 in a vent, it is on level 3 in one of the corners crawling on the wall.
Hidden Spider 53 — You can find the 5th one in the first hallway after leaving the large area where you saved the scientists and found Hidden Spider #3 and #4. This hallway will also have acid all over the floor. It is in the first ventilation unit on the left side. You will need to throw an acid egg at the fan in order to be able to get into it.
Hidden Spider 54 — You can find the 6th one the area where you have to save all of the civilians. After you have saved them all, it will be on the wall of the entrance you came in from. It does not matter which ventilation unit you enter in from, but it is directly in the back of the left vent if you are looking at the entrance. You will just need to throw an acid egg at one of the fans to be able to get in the vent. It is crawling around on the back wall in the vent.
Hidden Spider 55 — You can find the 7th one in another ventilation unit at the same level up top where you found Hidden Spider #6. This ventilation unit is above and to the left of where you brought all the civilians. You will once again need to throw an acid egg at the fan in order to be able to get in it. It will be crawling on the left wall when you get in the vent.
Hidden Spider 56 — You can find the 8th one on the top of the giant globe at the far end of the metro line. This is the same area but instead the opposite end of where you saved the civilians as well as found Hidden Spiders #6 and #7 in.
This video shows how to find all 8 Hidden Spiders in level 7 “Scorpion”:
Hidden Spider 57 — You can find the 1st one near the top of the largest tower on the first oil rig. It is crawling around on the gray wall of the tower. You will need to continuously web-jump up here and then web-zip to the railing in order to get on the platform.
Hidden Spider 58 — You can find the 2nd one on the right side of the oil rig from where you originally started off from when you jumped onto the main oil rig. This is at the first oil rig. It will be inside an area where part of the meshed wall is broken. Once you climb into it crawl up the wall to find the Hidden Spider all the way at the top on the red part of the wall.
Hidden Spider 59 — You can find the 3rd one beneath the helipad with 2 cameras in front of it, 1 camera on it and 4 flames continuously shooting from the corners of it. This is at the first oil rig. It will be crawling on the gray wall just below the helipad.
Hidden Spider 60 — You can find the 4th one below the largest tower at the first oil rig. It is on the side with the large TV, it is crawling on the TV.
Hidden Spider 61 — You can find the 5th one in the silo where you have to crawl up it on your way to the second oil rig and after you leave the first oil rig. It is between two steam vents as you climb up the silo.
Hidden Spider 62 — You can find the 6th one on the highest platform on the second oil rig. This is also above the silo where you came out of as you entered the second rig. You will need to web-jump up continuously and then web-zip to the railing. It is crawling at the back of the platform on the gray wall in the corner.
Hidden Spider 63 — You can find the 7th one crawling alongside a blue and orange painted building at the far left corner from where you entered the second oil rig from. It is in the back near the bottom of this building. You do not have to jump from where I am at in order to get this; you can instead crawl down from the building onto the side of it.
Hidden Spider 64 — You can find the 8th one inside a TV studio on the second oil rig. This TV studio is hidden though; you will need to head to the right corner from where you entered the second oil rig from to find a meshed area where you can drop into it. Once you dropped into the meshed area, climb up the wall inside it to find a doorway at the very top. The Hidden Spider will be crawling on the floor in front of the set.
This video shows how to find all 8 Hidden Spiders in level 8 “Deadpool”: