View source for Portal 2 Co-op Course 1 Chamber 4

{{Chamber infobox
  | title      = Rat Maze
  | valve-title= Rat Maze
  | map        = mp_coop_rat_maze.bsp
  | number     = 04
  | total      = 06
  | screenshot = Portal 2 Co-op Course 1 Chamber 4 overview.jpg
  | icon1      = water hazard
  | icon2      = player button on
  | icon3      = cube button
  | icon4      = cube hazard
  | icon5      = pass cube
  | icon6      = turret hazard
  | icon7      = laser hazard
  | icon8      = laser redirection on
  | icon9      = crusher hazard on
  | icon10     = dirty water
  | previous   = Portal 2 Co-op Course 1 Chamber 3
  | next       = Portal 2 Co-op Course 1 Chamber 5
}}

This is the fifth level in Co-op mode of Portal 2 and the fourth chamber in the course. There are no obvious dangers in this chamber, but the player in charge of the buttons can accidentally crush the player in the maze with the blocks.

{{Spoiler|block=on|The goal in this chamber is to get the [[Discouragement Redirection Cube]] from behind the glass and use it to reflect the beam to the receptacle.}}

== Mechanics ==
# [[Portal]]ble surfaces...{{Explain}}
# 2 [[Heavy Duty Super-Colliding Super Button]]s
# 1 [[Thermal Discouragement Beam]]

== Hazards ==
# Being crushed
{{clear}}
== Walkthrough ==
=== Naive ===
{{walkthrough | nodemo = true}}
{{Coop walkthrough table
  |   pbody-1 = {{Spoiler|Fire your portal on the top left corner and on a panel near the buttons. Go through the portal and walk to the end of the hallway and stand under the light.}}
  |   atlas-2 = {{Spoiler|Stand on the [[Heavy Duty Super-Colliding Super Button]] with the arrow pointing towards the glass.}}
  |   pbody-3 = {{Spoiler|Walk to the new small area and wait for your partner to walk off from the button.}}
  |   atlas-4 = {{Spoiler|Walk away from the button and wait for your partner to go to the end of the first floor.}}
  |   pbody-5 = {{Spoiler|Proceed to the end of the floor, jump down and turn around.}}
  |   atlas-6 = {{Spoiler|Go stand on the same button.}}
  |   pbody-7 = {{Spoiler|Jump down and run to the end of the hallway and stop before the final drop.}}
  |   atlas-8 = {{Spoiler|Stand on the other button.}}
  |   pbody-9 = {{Spoiler|Get on the yellow block and fire the portal from the top of the maze.}}
  |  atlas-10 = {{Spoiler|Get away from the button after your partner has fired the portal on the wall.}}
  |  pbody-11 = {{Spoiler|Pick up the [[Discouragement Redirection Cube]] and get back on the block.}}
  |  atlas-12 = {{Spoiler|Stand on the button again.}}
  |  atlas-13 = {{Spoiler|Place portals on the panels next to the beam and on the wall facing the beam receptacle.}}
  |  pbody-13 = {{Spoiler|Go through the portal and place the Cube under the Thermal Discouragement Beam and aim the beam on the panels next to it.}}
  |   both-14 = {{Spoiler|Proceed to the disassembly area.}}
}}
=== Speedrunning ===
==== Best time ====
==== Fewest portals ====

== Gallery ==
{{Gallery
|width=192
|height=108
|lines=1
|File:Portal 2 Co-op Course 1 Chamber 4 View 1.png|alt1=Super Button platform.|Super Button platform.
|File:Portal 2 Co-op Course 1 Chamber 4 View 2.png|alt2=View of the exit.|View of the exit.
}}

== Achievements ==
=== Team Building ===
{{Show achievement|Portal 2|Team Building|story-related|self-explanatory.
}}

== [[GLaDOS]]' voice lines ==
* {{Voice line|GLaDOS|coop hub track09}}
* {{Voice line|GLaDOS|mp coop test chamber both09 01}}

Crushing deaths:
* {{Voice line|GLaDOS|mp_coop_laser_crushercrush01}}
* {{Voice line|GLaDOS|mp_coop_laser_crushercrush02}} when [[Atlas]] kills [[P-body]].
* {{Voice line|GLaDOS|mp_coop_laser_crushercrush03}}
* {{Voice line|GLaDOS|mp_coop_laser_crushercrush04}}
* {{Voice line|GLaDOS|mp_coop_laser_crushercrush05}}
* {{Voice line|GLaDOS|mp_coop_laser_crushercrush06}}
Finish:
* {{Voice line|GLaDOS|mp coop laser 207}}
* {{Voice line|GLaDOS|mp_coop_laser_209}}
* {{Voice line|GLaDOS|mp_coop_laser_210}}

{{stub}}
{{Needimage}}
{{cleanup|reason=1. use [[Portal Wiki:Help:Walkthrough table]].<br />2. Fix YouTube embeds.}}

[[Category:Portal 2 Co-op chambers]]