Portal: Still Alive Test Chamber 3 (Bonus)

This test chamber is the third bonus level of the game. It is based off a level from Portal: The Flash Version MapPack. The challenges of this level are unlocked when the test chamber is completed once.

Hazards

 * Cube Hazard

Walkthrough

 * Proceed through the corridor and through the door on your right.
 * Go through the door to the right and shoot a portal on the wall near the second closed door.
 * Go back to the first area and shoot the other portal near the button.
 * Press the button, then quickly run through the portal and through the now open door.
 * Use the Victory Lift to reach the corridor above. Proceed into the next part of the chamber.
 * Go through the fizzler on the left and shoot a portal through the glass hole into the first area.
 * Place the other portal on the portal surface towards the back of the room. Go through and grab the cube.
 * Go back through the portal and use the cube to climb up the ledges next to the portal surface.
 * Place the cube on the button.
 * Jump back down the ledge and shoot a portal through the door opened by the button.
 * Go through your other portal into this room.
 * Shoot a portal through the glass hole into the first area. Go through the portal
 * Press the button to spawn a new cube, and bring it back through the portal. Place it on the button.
 * Go back through the portal and proceed to the exit.

Trivia

 * There is a glitch allowing the player to obtain a theoretically infinite number of cubes.