Drop from the end of the catwalk to the end of pipe directly below.
Drop to the girder directly to the right and walk across it towards the Repulsion Gel pipe.
Drop to the pipe and cross to the cliff.
Drop to the cliff and walk towards the tall structure.
Jump to the structure and get to the top either by climbing the stairs or riding the elevator.
Jump down to the higher cliff ledge.
Walk forwards and enter the doorway after the fire in it goes out.
First Office
Enter the door labelled "MAIN OFFICE".
Enter the door labelled "CONTROL ROOM".
Flip the lever at the left side of the control room.
Exit the control room and go to the window to the right of the Cave Johnson portrait, which has now broken.
Place your first portal underneath the falling water.
Go to the large fire to the left if the control room door and place your second portal on the wall beside it to put it out with the water.
Follow the hallway behind the extinguished fire.
At the end of the hallway there is an open door on the right blocked by a crate. Pick up and move the crate to get through the door. (You don't need to take the crate with you)
In the next room, enter the door at the left and go through the office space to the stairwell.
Go down the stairs and out into the large room with gel pumps.
Place your first portal up on the wall at the end of the area.
Place your second portal on the wall above the ledge at the back of the area.
Stack crates to get up to your first portal and go through.
Go through the door into the next office area.
Second Office
Go through the door to the left.
Flip the lever in the middle of the room to dispense Repulsion Gel.
Place your first portal underneath the Repulsion Gel.
Return to the office area and place your second portal on the wall beside the collapsed passage to get Repulsion Gel on the floor.
Bounce up to the space above the collapsed passage to get to the other side.
Flip the lever to open a door back to the first area.
Walk back to the first area and enter the office on the right.
Take the [[Weighted Storage Cube to the second area. It's easier to go the newly opened way so that the Weighted Storage Cube doesn't get covered in Repulsion Gel.
Place the Weighted Storage Cube on the desk to the left of the vent and use it to climb up.
Go through the vent and the hall after it to reach another control room.
Control Room
Flip the lever and wait a few seconds for the doors to unlock.
Go through the door at the left side of the control room.
Place your first portal on the wall at the catwalk above above you.
Drop down to the floor and place your second portal on a wall and go through it.
From the higher catwalk, move your second portal underneath the falling water on top of the control room.
Go through the portal to get on top of the control room.
Drop off the right side of the control room to the catwalk there.
Move your first portal to the angled portal surface to the right to launch water onto the fire blocking your path.
Follow the catwalk to the next door and go through.
Seal 04
Enter the small control room at the left side of the room and flip the lever there to dispense Repulsion Gel.
Place your first portal underneath the Repulsion Gel.
Move your second portal across the inside walls of the two pillars at the front of the room to cover them in Repulsion Gel.
Bounce up between the pillars to get to the top and get onto the catwalk wrapping around the pillars.
Follow the catwalk to the next small control room and flip the lever there to dispense Propulsion Gel.
Move your second portal over the wall next to the first small control room to create a runway of Propulsion Gel.
Move your first portal to the wall on the ledge above and to the right of the runway.
Move your second portal to the wall at the end of the runway.
Go through the portal and move your first portal to the portal surface on the floor there.
Drop to the ground and run on the runway into the portal to fling yourself into the air and land on a platform.
Climb the catwalk stairs to the third small control room.
Move your portals to the two portal surfaces on either side of the room, next to the levers.
Flip both levers in quick succession, then flip the lever in the middle of the room to open the seal and lower a lift.
Go back down the catwalk to the platform you flung yourself up to.
Drop from the platform to a pipe. (If you're confused, it's lined up with a lamphead on the side of the platform)
Cross the pipe to the lift and jump in, and it will carry you up.
Once at the top, walk to the door to the right and enter.
Advanced Mode
Crumbling Entrance
Drop from the end of the catwalk to the end of pipe directly below.
Drop to the girder directly to the right and walk across it towards the Repulsion Gel pipe.
Drop to the pipe and cross to the cliff.
Drop to the cliff and walk towards the tall structure.
Jump to the structure and get to the top either by climbing the stairs or riding the elevator.
Jump down to the higher cliff ledge.
Walk forwards and enter the doorway after the fire in it goes out.
First Office
Enter the door labelled "MAIN OFFICE".
Enter the door labelled "CONTROL ROOM".
Flip the lever at the left side of the control room.
Exit the control room and go to the window to the right of the Cave Johnson portrait, which has now broken.
Place your first portal underneath the falling water.
Go to the large fire to the left if the control room door and place your second portal on the wall beside it to put it out with the water.
Follow the hallway behind the extinguished fire.
At the end of the hallway there is an open door on the right blocked by a crate. Pick up and move the crate to get through the door. (You don't need to take the crate with you)
In the next room, enter the door at the left and go through the office space to the stairwell.
Go down the stairs and out into the large room with gel pumps.
Place your first portal up on the wall at the end of the area.
Place your second portal on the wall above the ledge at the back of the area.
Stack crates to get up to your first portal and go through.
Go through the door into the next office area.
Second Office
Go through the door to the left.
Flip the lever in the middle of the room to dispense Repulsion Gel.
Place your first portal underneath the Repulsion Gel.
Return to the office area and place your second portal on the wall beside the collapsed passage to get Repulsion Gel on the floor.
Bounce up to the space above the collapsed passage to get to the other side.
Flip the lever to open a door back to the first area.
Walk back to the first area and enter the office on the right.
Take the [[Weighted Storage Cube to the second area. It's easier to go the newly opened way so that the Weighted Storage Cube doesn't get covered in Repulsion Gel.
Place the Weighted Storage Cube on the desk to the left of the vent and use it to climb up.
Go through the vent and the hall after it to reach another control room.
Control Room
Flip the lever and wait a few seconds for the doors to unlock.
Go through the door at the left side of the control room.
Place your first portal on the wall at the catwalk above above you.
Drop down to the floor and place your second portal on a wall and go through it.
From the higher catwalk, move your second portal underneath the falling water on top of the control room.
Go through the portal to get on top of the control room.
Drop off the right side of the control room to the catwalk there.
Move your first portal to the angled portal surface to the right to launch water onto the fire blocking your path.
Follow the catwalk to the next door and go through.
Seal 04
Enter the small control room at the left side of the room and flip the lever there to dispense Repulsion Gel.
Place your first portal underneath the Repulsion Gel.
Move your second portal across the inside walls of the two pillars at the front of the room to cover them in Repulsion Gel.
Bounce up between the pillars to get to the top and get onto the catwalk wrapping around the pillars.
Move your second portal to the floor below the catwalk to create a puddle of [[Repulsion Gel].
Use the Repulsion Gel to bounce to the other side of the gap.
Follow the catwalk to the next small control room and flip the lever there to dispense Propulsion Gel.
Map: st_a2_firestorm.bsp
