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Aperture crushers.jpg
General information

Aperture Science


Hazardous testing element

Used by
"Had a bit of a brain wave. There I was, smashing some steel plates together, and I thought, 'yes, it's deadly. But what's missing? What's missing?' And I thought lots of sharp bits welded onto the flat bits."

The crusher, also known as the masher, is a testing element with the sole purpose of killing or destroying Test Subjects.


Stationary crushers in Test Chamber 09 of the Excursion Funnels Testing Course.

Crushers consist of a thick spiked plate and an optional driving mechanism in the form of one or more pistons, a robotic arm, or a combination of both. In Portal 2's singleplayer campaign, only dynamic crushers are encountered, and any contact with them results in immediate death. In addition to those, the co-op mode also includes stationary spiked plates which deal either 2.5 points of damage every 0.5 second (10 points of damage if the subject is pressed into them via an Excursion Funnel) or destroy their victim instantly.[1]


Portal 2[edit]

Crushers can first be spotted in the singleplayer campaign chapter The Courtesy Call. After GLaDOS is reawakened, they're seen during the fall from the Central AI Chamber to the Incinerator Room where they appear to serve as defective product smashers.

They are then formally introduced by Wheatley after he assumes power in the Enrichment Center in a death trap against Chell and GLaDOS. He claims to have invented them after deciding that flat steel plates weren't deadly enough. He also notes that he would like them to eventually shoot fire moments before crushing their victim. After the duo escapes the first death trap, Wheatley repeatedly attempts to use crushers to kill them and even tries to persuade Chell to jump into one located at the end of a conveyor belt.

When GLaDOS regains control over the Enrichment Center, she adapts crushers into the Cooperative Testing Courses. They appear in every Testing Course except for Hard-Light Surfaces.

Peer Review[edit]

Only a single crusher is encountered in the Art Therapy Testing Course. It unexpectedly smashes into the floor in front of ATLAS and P-body at the beginning of Test Chamber 01 while GLaDOS comments on its artistic value.

Lego Dimensions[edit]

Crushers appear in the GLaD to See You level of the game's campaign. Of note is their utilization in the boss battle, both by GLaDOS and the player.

The Lab[edit]

Crushers can be seen at the end of The Lab's Robot Repair experiment in a testing chamber the player is sent to when they eventually fail to perform their task.

Related Achievements[edit]

Portal 2
WHEATLEY TRIES TO.jpg The Part Where He Kills You (20G)
This is that part.

Behind the scenes[edit]

Crusher in the earliest Portal trailer

Although it was not originally named, a moving ceiling with spikes was demonstrated in the earliest Portal trailer. It can also be seen in Portal: The Flash Version, remade by fans for Portal as Portal: The Flash Version MapPack. The first official title in which it is included and in which its name is revealed is Portal: Still Alive as it features some maps from The Flash Version MapPack.

Crushers are discussed several times in Portal 2's in-game commentary mode. Cayle George stated that there were to be several levels utilizing crushers in ways that made the test chambers more dangerous. After showing some of these levels in press demos, Valve received the feedback that viewers were getting the impression that Portal 2 was going to be too difficult since players would have to time events such as running or falling through a portal without getting hit by a deadly crusher. The team decided to save these for the escape when Wheatley tries to hold the player off.[2]

According to former Valve programmer Kutta Srinivasan, one of Wheatley's planned attacks during the final battle was to involve crushers. It wasn't implemented as it proved too punishing; players were focused on what Wheatley was doing and would often get hit by a crusher they weren't paying attention to.[2] Crushers can be seen in the concept art for the final battle and in a diagram by the boss fight's designer Phil Co.

Andrea Wicklund remarked that the co-op mode was to include an elaborate death animation for the crusher, showing its victim being slowly crushed under it. It proved to be too repetitive and therefore punishing and preventing players from taking risks, so the developers decided to work on creating a quick but nevertheless satisfying animation instead.[2]

An unused icon for the crusher can be found in the Perpetual Testing Initiative game files.


In the Aperture Investment Opportunity #1: "Panels" promotional video, CEO Cave Johnson states that Aperture Science sells crushers. The crusher sequence here was animated and lit by Valve animator Joe Han.[3]


Portal: Still Alive[edit]

Portal 2[edit]




List of appearances[edit]

Main games[edit]



Combine OverWiki has more images related to Crusher.
  1. Portal 2 Collector's Edition Guide, page 11
  2. 2.0 2.1 2.2 Portal 2 commentary
  3. Joe Han Animation Demo Reel 2013 on Vimeo