We need to hit the button that’s hanging in mid air next to the big arrow. Glide over to it to confirm that the door is still locked. This will raise the ramp and let you reach the exit platform. Use a portal through the hole to get past the glass, and then backtrack with portals to take the box back to the start. Run back over, and then glide across the next gap to find the box that you need. Hit the button, and put the blue portal on the impact spot to grease the hallway. Put the orange portal on the marker, and travel back to the platform. Keep the blue one as your access to the button, otherwise this will get annoying really fast. Don’t try to jump, since that can mess up your momentum. Just put your back to the wall and walk forward, you’ll pick up enough speed and glide across just from the running. This will grease up the entire path, and let you jump the gap. Put one portal on the radioactive marker behind the ramp and one on the impact spot. You can only get short bursts of the red gel, but we won’t need too much of it for any one part. Start by getting up onto the platform with the switch.
This red stuff greatly reduces friction, and we have one very full course to use it on.
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