Warnings Active: Cube Hitting Head

This one is similar to the last one, except the orange portal is lifted so that you cannot reach it. Shoot a portal into the pit, underneath the cube located there, and then follow it through. Push the cube off the platform and then shoot a portal across the way to the other raised platform. Go through the orange portal and push THAT cube off of its platform as well. Jump back to the ground and put the cubes on the buttons. Now go through the door; you will find yourself locked in. The orange portal is located on the other side of a glass ceiling above you; make a portal on the floor or walls within your reach and walk through it to continue on.

Portal Walkthrough