Alternative Portal end
Chell had quickly navigated through the test chambers. She was already at test 19. Before starting the test she stared at the picture of cake on the board that showed some of what she would have to do. Her mouth salivated as she thought to herself 'the cake is a lie, the cake is a lie, the cake is a lie'. The marks left by that poor man had always been true. They had shown her where to place her portals to destroy the turrets and they had prepared her for the loss of her best friend.
She redirected the energy pellet then hopped onto the stationary scaffold. Then she jumped over into a small room with a button. The button opened a door that would push her into the toxin below while riding the scaffold. Her portal went on one side of the door and another in front of her. As the scaffold passed she stepped through the portal back onto it.
An energy pellet in front of her seemed to dance as it hit the walls back and forth. She quickly redirected it then closed her portal to avoid vaporization. Half a wall approached her. Her gun flew to the open side of it and shot a portal and her other went on the wall. She jumped through the portal on the wall as the scaffold went under it and landed back on it. The image of cake was in front of her.
"Congratulations, the test is now over. The Aperture Science Stationary Scaffold will now escort you to the cake." GLaDOS' voice clicked on. Tears came to Chell's eyes when she saw the party being thrown for her completion of the tests. Her scorched best friend was sitting by the cake with a party hat slightly covering the heart on top of it.
Doug Rattmann was also there holding his own Companion Cube and congratulating her. Chell's project from Bring Your Daughter to Work Day was sitting on a table beside him with a first prize ribbon attached. She picked up a few plates and cut enough cake for all four of them. Then she sat on the floor and talked with her Companion Cube.
That was when neurotoxin emitters came into the room. They started spraying confetti all over the room. Cats started coming in for the party from the emitters as well. Everyone was thrilled. GLaDOS was happy that she had decided to take out the fire pit and replace it with this.
Authors Note: My 12 year old black lab passed away today so I wanted to end today with something happy. I hope you enjoy this unlikely but happy end to Portal.