As soon as the Pellet enter the portal, quickly go through fizzler again and place portals that Pellet enters the receptacle.After the pellet goes through the portal, quickly go through the fizzler and fire the portals that Pellet goes to the receptacle.Place a blue portal where the Pellet launchs straight and the other portal where the Pellet can go through fizzler.If you walk through the fizzler, the portals will close. The portals are prevented by the fizzlers. Quickly place a portal in the white wall panel. You will need to do a terminal velocity.As you enter this chamber, place a portal up in the tile ceiling and place a portal down on the white tiles.