Portal/Escape 02

This is the last part of Portal. Once you complete this, you may get the heartbreaker achievement.

Getting to the top
Get past the sewers and at the end you see a wall that's portal-friendly. Get there. Now just try to portal out of the gooey, but not lethal water. Once you get to the surface, you hear an alarm and turrets will shoot you to death.

Try to take cover as they shoot you and while they shoot, put a portal behind them and put another near you (wall or floor, your choice). Then take them out.

Once you take out all of the turrets, find the turret that's on the highest floor. Put a portal in that alcove, and put a portal nearby. Once in that location, scan the room for a slanted wall. Once you find it, put a portal on top of it.

Here's the trick to find a few more turrets: Put another portal near you, then pass it. You may fall and put another portal in time before you land. You are flinging in the sky. Your super jump is not high and fast enough to get where you need to go, but enough to make you able to target another slanted wall that's even higher. Put a portal there and do the same for the other portal.

Now you have enough to reach the higher ledge.

To the boss
Now quickly go behind the turrets as they will be delivered to kill you, then take out the two turrets. Now you have to jump your way up a hole. Put a portal on where you will jump on the hole, and put another on the floor of the main room. Now jump on the portal and you may find that it is enough to build your way up the hole.

Now just aim yourself to the next platform and then follow a catwalk followed by some doors you just need to open.

GlaDoS
Now you get to battle the boss: GlaDoS.

After her talking, put the core near the incinerator, then portal to the room with the button. Put another portal near you. Pass through the portal and press the button. Quickly put the core in the incinerator.

GlaDoS explains that the core you just destroyed was a recent morality core that stops her from filling Aperture laboratories with neurotoxin and other deadly gasses.

Now she gives you six minutes to finish her off and a rocket launcher to dodge. This bot has the advantage, because you can't shoot her cores out because it's a portal gun. Now shoot a portal to a wall that is available to shoot GlaDoS. Put another portal that is on line to GlaDoS. Now make the bot shoot you while lined up with the portal. When it locks on you, dodge quickly and it will shoot GlaDoS instead.

The next core is on a pipe. Portal to the core and incinerate it. Do the same two more times and you win the game!