Review advanced portal locomotion techniques such as the Fling, Floor-to-Floor, Portal Ledge, Double Fling, and Wedge Fling in the Advanced Placement Portal Science section in Not Quite Rocket Science: A Portal Overview
Portals
Goal: Bronze Medal
Portal Limit : 9 or less.
Strategy: Use two portals to get past the second turret, then simply pass the turret on the stairs. Use two portals to destroy first turret in the hall, and one to destroy the second. Reuse your last portal and teleport behind the pair of turrets in the next room. Use one portal to destroy the farthest turret in the last room. Then pick up the turret nearest to you and smash the one on the far right. Place a portal on the floor to teleport past the first mesh wall, and one more to teleport past the final one.
Goal: Silver Medal
Portal Limit: 4 or less.
Strategy: Pick up the first turret, and use it to smash the second and third ones. Physically smash both hall turrets with a Cube. Smash the turret pair in the large room with a Cube as well. Use two portals to destroy farthest turret in the smaller room to your left. Then pick up the nearest turret and smash the far-right turret. Use one portal on the floor to teleport past the first mesh wall, and one more to teleport past final one.
Goal: Gold Medal
Portal Limit : 2 or less.
Strategy: You have to save both portals to exit the Test Chamber past the final mesh wall, so build lots of Cube forts, and physically destroy all the turrets in your path.
Steps
Goal: Bronze Medal
Steps Limit: 70 or less.
Strategy: You can easily take 70 or fewer steps if you use lots of portals instead of walking.
Goal: Silver Medal
Steps Limit: 55 or less.
Strategy: Again, make heavy use of portals instead of running, but be sure to smash the turret pair in the larger room before the button with Cubes. Portal directly from the button to the final room.
Goal: Gold Medal
Steps Limit: 40 or less.
Strategy: Continue your habit of portal-locomotion, but when you reach the area with Cubes blocking the prison, get on top of the horizontal piston using a ceiling portal. This allows you to stand with a portal around your waist and teleport around the Test Chamber without walking. Place your portals quickly to avoid being shot.
Time
Goal: Bronze Medal
Time Limit: 1:10 or less.
Strategy: Portal past the first two hallways. Destroy the crossfire turrets with Cubes. Portal past the turret pair behind the glass wall. Drop the first turret in the room to your left on the one nearest it, then teleport behind the third turret. You can safely portal past the last two to the exit.
Goal: Silver Medal
Time Limit: 1:00 or less.
Strategy: Portal past the first two hallways. Drop a Cube on the first crossfire turret and use the other Cube to shield you through the next three. Drop the nearest turret in the button room onto the one closest to it, and jump behind the last one in the alcove. Portal past the last two turrets behind the blast doors.
Goal: Gold Medal
Time Limit: 0:52 or less.
Strategy: Portal past the first hallway. Same through the second, but make sure the first crossfire turret doesn’t spot you. Run through the crossfire hallway and round the corner while hugging the glass wall. Pick up the first turret in the large room and smash the other with it. Pick up the nearest turret in the button room and use it to smash the one closest to it. Place one of the disabled turrets on the button and crouch behind it for cover from the alcove turret’s fire. Portal past the last two turrets behind the blast door.