Least Portals Challenges

I will demonstrate how you can complete all of the Least Portals challenges in Portal to work towards the Aperture Science Achievement.

Introduction

This series of guides will teach you how to obtain the Aperture Science achievement in Portal. Before you're able to achieve this you need to have finished the game first for the Bonus Challenges to unlock.



This guide will show you how to get Gold on all of the Least Portals Challenges. If you've already completed Least Portals you can find my guides for Least Steps and Least Time below.

http://steamcommunity.com/sharedfiles/filedetails/?id=132001911
http://steamcommunity.com/sharedfiles/filedetails/?id=132082820

Test Chamber 13

Test Chamber 13 can take some time to get used to. You really only have one shot per load so quick saving right before you throw the cube is a good idea. To throw the cube, jump with some forward momentum and click on your fire button.

• Bronze: 9
  
• Silver: 5
  
• Gold: 4

Test Chamber 14

This one is really simple, you can skip almost the entire puzzle. My only piece of advice is that you should wait until the stairs have all gone down before jumping. If you do it too soon it wont place a Portal which means you have to reload.

• Bronze: 6
  
• Silver: 4
  
• Gold: 2

Test Chamber 15

During the video you'll notice that I'm balancing between two portals. Creep in just enough so you can see the opposite colored Portal to the one you just entered before placing another. Don't move in too far or you will end up falling out. Placing the Portal directly underneath the exit elevator is your key to success, if you fail to land that correctly you may end up having to reload.

• Bronze: 23
  
• Silver: 21
  
• Gold: 14

Test Chamber 16

You'll become a wrecking ball in this challenge. Grab the first Turret and just go crazy. Use it as a shield and upgrade to a cube as soon as possible. Angle the cube downwards to provide better shielding against the onslaught of firing power.

• Bronze: 9
  
• Silver: 4
  
• Gold: 2

Test Chamber 17

The only thing you need to do to in this chamber is use your Portal gun to get the camera off of the wall. Place it slightly away from the wall so it can cover the entire surface of the cube while also keeping it balanced.

• Bronze: 4
  
• Silver: 3
  
• Gold: 2

Test Chamber 18

Test Chamber 18 requires you to be very frugal with your Portals. Use the cube you obtain as a shield to guard yourself from turret fire and backtrack to previously placed Portals to gain momentum.

• Bronze: 30
  
• Silver: 25
  
• Gold: 16

Closing Notes

If you have any questions or comments regarding this guide please feel free to leave a comment below.

You can also check out all of my other Steam Guides here.

[Le Flippers]

Chamber 13 you don't even have to throw the cube. If you manage to pick up the cube in the first room without any portals you can place it on the pad, then jump on it and shoot the same portal as the third portal in the video. then just place the second portal just like in the video. Meaning you'd be able to take the cube through and instead of throwing it just leave it, and jump your self across, then portal in. This could potentially be used to complete the room in 3 portals.

[[TG]]

super helpful! got all of the challenges done with this guide. only part that really gave me trouble was the 13th portal in chamber 15.

[Darthtaters8]

on chamber 13 least portals the cube throw is really hard, no not really hard, IMPOSSIBLE!

[Mazda Miata Mx5 RF GT]

I have 0 on most

[Mitsu]

I did those exact chambers following the videos but didn't get the achievement, am I missing something?

[AmpreHourPenguin]

So did something in the physics change? I can't throw the cube in 13 like that, or fling it in any way to get it on the pedestal let alone the button. It drops almost straight down if I try it like in the video and bounces off the edge of the pedestal if I fling it upward (while moving forward obvs)

[omasque]

chamber 14 is easy

[Barack Yomama]

In chamber 17 it is easy enough to use-hop up the ledge without firing a single portal

[LugiNess]

nevermind

[LugiNess]

How do you do chamber 13 like that?