Chamber 17

Portals

Goal: Bronze Medal

Portal Limit: 4 or less.

Strategy: Don’t squander any portals getting down the twin hallways; use the Cube to deflect the energy balls instead. Place one portal in front of the second Ball Launcher and one more to the solve door puzzle in the button room. Walk back through these portals. Use two more to solve the wedge puzzle. Proceed as normal from here, using no additional portals.

Goal: Silver Medal

Portal Limit: 3 or less.

Strategy: Place one portal in front of the first Ball Launcher. Use the Cube to get through the twin hallways. Use one portal to solve the door puzzle, and one more to solve the wedge puzzle. Solve the puzzle in the close-quarters Catcher/Launcher room, and exit the chamber using no additional portals.

Goal: Gold Medal

Portal Limit: 2 or less.

Strategy: Place one portal in front of the first Ball Launcher. Use the Cube to get through the twin hallways. Use one portal to solve the door puzzle in the button room, and use this same portal to solve the wedge puzzle by deflecting the ball with the Cube. Solve the puzzle in the close-quarters Catcher/Launcher room, and exit the chamber using no additional portals.

Steps

Goal: Bronze Medal

Steps Limit: 215 or less.

Strategy: Hop through the twin hallways to preserve steps. Leave one portal in front of the second Ball Launcher. Solve the wedge puzzle as normal. Hop back and place a portal in front of the first Launcher. Hop to the door puzzle in the button room and solve it. Hop to in the close-quarters Catcher/Launcher room and solve it. Hop to the exit.

Goal: Silver Medal

Steps Limit: 175 or less.

Strategy: Leave one portal in front of the first Launcher. Hop through the twin hallways to preserve steps. Solve the wedge puzzle as normal. Hop to the door puzzle in the button room and solve it. Hop into the close-quarters Catcher/Launcher room and solve it. Hop to the exit.

Goal: Gold Medal

Steps Limit: 150 or less.

Strategy: Leave one portal in front of the first Launcher. Hop through the twin hallways to preserve steps. Solve the wedge puzzle as normal. Hop to the button in the Cube puzzle and deflect the ball into the Catcher with the Cube. Hop to the in the close-quarters Catcher/Launcher room and solve it. Hop to the exit.

Time

Goal: Bronze Medal

Time Limit: 2:20 or less.

Strategy: Carry the Cube through the twin hallways to the close-quarters Catcher/Launcher room and solve the bounce puzzle. Solve the puzzle in the red button room with the ball from the second hallway. Complete the wedge puzzle with the ball from the first hallway. Carry the Cube to the incinerator and exit the Test Chamber.

Goal: Silver Medal

Time Limit: 1:45 or less.

Strategy: Carry on as you did for the Bronze Medal, but stop where the first energy ball hits the wall and place a portal there. Carry the Cube to the bounce puzzle and solve it. Solve the wedge puzzle as normal. Complete the button room puzzle as normal. Carry the Cube to the incinerator and exit the Test Chamber.

Goal: Gold Medal

Time Limit: 1:27 or less.

Strategy: Carry on as you did for the Silver Medal, but when you complete the bounce puzzle in the close-quarters Launcher/Catcher room, set a portal for the door puzzle in the button room. Wait for the ball inside the room and trap it between both doors. Use the Cube to open the second door and activate the second lift. Set a portal for the wedge puzzle and carry the Cube to the final lift. Wait till it activates. Ride the lift halfway up, then jump to the ledge to shave off a few seconds. Carry the box to the incinerator and exit the Test Chamber.