The Blue Gel Testing - Test 2
Start by getting the box on the platform. Put a portal above either of the stops, and jump up to the white wall. Drop down onto the moving platform to grab the box. Carry it up with you on the bounce and set it on the button to unlock a higher platform. Put a portal on the new section of wall, and another behind you to get a bigger drop for the gel.
Go through the field, and quick save. If you botch this up, you can die. Throw yourself into the gel on either side to bounce back and forth until the end. Work with your momentum and you should be fine. Grab the box and jump up to the start to lay the box on the button. This unlocks a higher section of wall. Put a portal up there, and then drop through it to land on the exit platform. Walk out until you get to the loading screen.
The water’s still deadly, even if it looks shallow. Cross the wreckage to the center island, and look at the pillars for the light area at the top. Go up there, and use the angle to get by a button. Push the button to start dumping blue gel.
You can start covering the steps with blue gel. Just start by putting one portal on the impact spot, and another by place where you want it. Pull the portal out from under it before the glob goes back through. You can get the second step by putting the portal on the side of the wall.
You need to go through the field, so put some gel below the jumping off point and on the second platform so that you can chain the bounces up. Put one portal on the marked spot on the slanted platform, then walk around and put the portal at the impact spot again. After there’s some gel there to put you through to the exit, you can jump off of the edge and put a new portal below you, to follow the gel’s path, slingshot onto the pad and land at the exit. Walk out and go into the elevator.