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: 6 or less.
Strategy: Use two portals to fling to the Cube: one next to the observation glass, and one in the pit. Use two more to get across the goo-filled hallway. Use one portal in the Launcher room to teleport the ball and follow it out, making sure to leave the portal you placed at the opposite end of the hallway active. The last portal goes above the Catcher in the Cube’s original room.
Goal: Silver Medal
Portal Limit : 4 or less.
Strategy: Use two portals to fling to the Cube, but don’t use any to traverse the goo-filled hallway—hop across both ways instead. Use two more portals to activate the Ball Catcher.
Goal: Gold Medal
Portal Limit: 2 or less.
Strategy: Ignore all the puzzles in the chamber completely, and instead utilize the Floor-to-Floor technique (see Advanced Placement Portal Science in the Portal “Overview” Section) to hop onto the victory lift from the entrance passage. Place a portal on the ground near the lift, another deep into the stair pit. This should provide enough momentum to reach the exit grid.
Steps
Goal: Bronze Medal
Steps Limit: 55 or less.
Strategy: Portal yourself near the exit lift taking as few steps as possible. Place a portal near the exit lift and a second one above the Ball Catcher. Walk through. Fling to the Cube’s ledge, seize the Cube, and return to your portal near the Catcher. Use portals to return to the button, and place the Cube. Portal through the blast doors, and again across the goo-filled hallway. Now place a portal where the ball meets the wall, and travel through it back across the hallway. Place a portal above the Catcher. Finally, portal yourself onto the activated lift.
Goal: Silver Medal
Steps Limit: 20 or less.
Strategy: Portal yourself near the exit lift taking as few steps as possible. Place a portal on the floor near the exit lift, and another above the Ball Catcher beyond the pit. This should give you enough momentum to Floor-to-Floor onto the lift without solving any puzzles.
Goal: Gold Medal
Steps Limit: 10 or less.
Strategy: Portal yourself near the exit lift taking as few steps as possible. Place a portal on the floor near the exit lift, and another on the ceiling above the stair pit. Fall into the floor portal and place another portal on the floor of the pit as you fall through the ceiling. This provides you with enough momentum to Floor-to-Floor onto the exit lift without solving any puzzles.
Time
Goal: Bronze Medal
Time Limit: 0:50 or less.
Strategy: Place portals to get you near the exit lift. Then portal yourself to the top of the stairs. Next, fling onto the ledge where the Cube is, and travel back to the button via portals. Portal through the blast doors and across the goo-filled hallway. Place a portal where the ball meets the wall and follow it out to the entrance of the goo-filled hallway. Place your last portal above the Ball Catcher, and wait for the victory lift.
Goal: Silver Medal
Time Limit: 0:20 or less.
Strategy: Portal to the victory lift, then to the top of stairs, making sure to leave a portal on the ground near the lift. Place a portal deep in the pit and jump through. Utilize downward momentum to Floor-to-Floor onto the lift.
Goal: Gold Medal
Time Limit: 0:10 or less.
Strategy: Portal yourself near the exit lift. Place a portal on the floor near the exit lift, and another on the ceiling above the stair pit. Fall into the floor portal, and place another portal on the floor of the pit as you fall through the ceiling. This provides you with enough momentum to Floor-to-Floor onto the exit lift without solving any puzzles.