Portal 2 Co-op Course 1 Chamber 4

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Course 1 - Part 4: Chamber 04
mp_coop_rat_maze.bsp Rat Maze

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Test Chamber Infobox previous.png
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Test Chamber Infobox Portal Guy.png
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Portal 2 Co-op Course 1 Chamber 4 overview.png
Chamber icon water hazard.pngChamber icon player button on.pngChamber icon cube button.pngChamber icon cube hazard.pngChamber icon pass cube.png
Chamber icon turret hazard.pngChamber icon laser hazard.pngChamber icon laser redirection on.pngChamber icon crusher hazard on.pngChamber icon dirty water.png

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.


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.




  • Being crushed


# Atlas P-body
1Fire 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.
2Stand on the Heavy Duty Super-Colliding Super Button with the arrow pointing towards the glass.
3Walk to the new small area and wait for your partner to walk off from the button.
4Walk away from the button and wait for your partner to go to the end of the first floor.
5Proceed to the end of the floor, jump down and turn around.
6Go stand on the same button.
7Jump down and run to the end of the hallway and stop before the final drop.
8Stand on the other button.
9Get on the yellow block and fire the portal from the top of the maze.
10Get away from the button after your partner has fired the portal on the wall.
11Pick up the Discouragement Redirection Cube and get back on the block.
12Stand on the button again.
13Place portals on the panels next to the beam and on the wall facing the beam receptacle.Go through the portal and place the Cube under the Thermal Discouragement Beam and aim the beam on the panels next to it.
14Proceed to the disassembly area.

Video walkthrough


Related achievements

Team Building
Team Building
Complete all test chambers in the Team Building co-op course