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Map: sp_a3_end Title: Three Gels
This is the forty-fifth level of the game, and as well as being the final part of Chapter 7, it is also the last level to take place within the old Aperture Science Enrichment Center. This level requires the player to utilise momentum, and combine the effects of Repulsion Gel, Propulsion Gel and Conversion Gel in order to proceed.
Go through the door and head to the area before you.
Fire a portal on the floor and the other on a pillar as high as you can.
Turn to face a door on the wall. Fire a portal above the door and the other on the floor below. Jump through the portal.
Shoot a portal on the floor with Repulsion Gel while keeping the other portal above the door. Wait for the gel to cover the panel.
Put the same portal on the floor below and jump through it and wait for landing.
Place a portal on the floor behind you. Jump down through the hole in the floor to get a little lower. Then jump through the portal on the floor.
Fire a portal through the metal support panels to the floor. Then enter through the portal.
Go through the Emancipation Grill ahead and place a portal on the Conversion Gel and then put the other portal to the ceiling at the end of the room.
Wait for the gel to cover the wall.
Place the portal on the wall and the other one under the Propulsion Gel.
Put the portal from the Propulsion Gel to the top of the wall. Fire the other one under it and run along the runway and go through the portal.
Shoot a portal on the floor and the other one under the flowing Conversion Gel.
Place the other portal above the floor. Then put the other portal under the Repulsion Gel.
Go to the floor below and fire the portals on the wall, one on the top and the other below it. Go to the start of the runway.
Run along the runway, go through the portals and wait for the final landing.
Go around the pillar and shoot a portal on the floor. Place the other portal on the wall higher up, through the metal grill.
Turn around and go forwards. Shoot the portal from the wall to the wall on the left.
Wait until the gel has painted the roof and shoot a portal from the floor to the roof. Before going through, make sure that there is a warning triangle in the view of the portal. If there is, go through the portal.
Go up until you reach the end. Then turn around and place a portal through the metal grill to a wall.
There should be a spot of Conversion Gel on the floor. Shoot the other portal on it and go through.
Walk over to the catwalk and go along it. Then turn right and go forwards.
Look up on the wall and you'll see a catwalk. Shoot a portal above the catwalk and the other one on your level and go through.
Go along the catwalk and turn left. Fire a portal on the wall on the right as high as you can. Place the other portal below the catwalk and jump through.
Push the red button and jump down from the room.
Head for the same catwalk and enter the elevator on the left.
Wait for the doors to open and then go to the left, up the stairs and through the door.
Go through the Emancipation Grill and get on the elevator.
